Demonstrators marched through the streets of Manhattan on Saturday to protest against recent police shootings of two black men, Alton Sterling in Baton Rouge, La., and Philando Castile, in Falcon Heights, Minn., just outside the Twin Cities.

The protest was the third in the city this week. Over a dozen people were arrested at the protest on Saturday, police said.

Sterling, 37, was shot and killed during a struggle with two police officers on Tuesday. A video shot by a bystander has been widely circulated in the aftermath. Castile, 32, was killed Wednesday night by a police officer during a traffic stop.

Both deaths are under investigation.

A woman holds a banner during a protest
A woman holds a banner during a protest in support of the Black Lives Matter movement in Manhattan on July 9, 2016. (Credit: Getty Images / Kena Betancur)
Crowds of people shout slogans during a protest
Crowds of people shout slogans during a protest in support of the Black Lives Matter movement at Times Square in Manhattan on July 9, 2016. (Credit: Getty Images / Kena Betancur)
Police officers stand guard during a protest in
Police officers stand guard during a protest in support of the Black Lives Matter movement at Times Square in Manhattan on July 9, 2016. (Credit: Getty Images / Kena Betancur)

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People shout slogans during a protest in support
People shout slogans during a protest in support of the Black Lives Matter movement in Manhattan on July 9, 2016. (Credit: Getty Images / Kena Betancur)
People shout slogans during a protest in support
People shout slogans during a protest in support of the Black Lives Matter movement in Manhattan on July 9, 2016. (Credit: Getty Images / Kena Betancur)
A police officer on patrol during a protest
A police officer on patrol during a protest in support of the Black Lives Matter movement in Manhattan on July 9, 2016. (Credit: Getty Images / Kena Betancur)
A man holds a banner during a protest
A man holds a banner during a protest in support of the Black Lives Matter movement in Manhattan on July 9, 2016. (Credit: Getty Images / Kena Betancur)
A woman holds a banner during a protest
A woman holds a banner during a protest in support of the Black Lives Matter movement in Manhattan on July 9, 2016. (Credit: Getty Images / Kena Betancur)

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People protest police-involved shootings at a march in
People protest police-involved shootings at a march in New York City on Friday, July 8, 2016. (Credit: Getty Images / Kena Betancur)
People protest police-involved shootings during a march in
People protest police-involved shootings during a march in New York City on Friday, July 8, 2016. (Credit: Getty Images / Kena Betancur)
People protest police-involved shootings during a march in
People protest police-involved shootings during a march in New York City on Friday, July 8, 2016. (Credit: Getty Images / Kena Betancur)
People protest police-involved shootings during a march in
People protest police-involved shootings during a march in New York City on Friday, July 8, 2016. (Credit: Getty Images / Kena Betancur)
A man holds a poster that shows pictures
A man holds a poster that shows pictures of police-shooting victims during a protest in Grand Central Station in Manhattan on Friday, July 8, 2016. (Credit: Getty Images / Kena Betancur)

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People cry out against police-involved shootings during a
People cry out against police-involved shootings during a protest in Grand Central Station in Manhattan on Friday, July 8, 2016. (Credit: Getty Images / Kena Betancur)
People protest police-involved shootings during a march in
People protest police-involved shootings during a march in New York City on Friday, July 8, 2016. (Credit: Getty Images/ Kena Betancur)
People protest police-involved shootings during a march in
People protest police-involved shootings during a march in New York City on Friday, July 8, 2016. (Credit: Getty Images / Kena Betancur)
Demonstrators sit down in Times Square on Thursday,
Demonstrators sit down in Times Square on Thursday, July 7, 2016, protesting the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Timothy A. Clary)
Demonstrators march through Manhattan on Thursday, July 7,
Demonstrators march through Manhattan on Thursday, July 7, 2016, protesting the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Timothy A. Clary)
Demonstrators gather in Manhattan on Thursday, July 7,
Demonstrators gather in Manhattan on Thursday, July 7, 2016, protesting the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Timothy A. Clary)
NYPD officers restrain a demonstrator during a march
NYPD officers restrain a demonstrator during a march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Timothy A. Clary)
A demonstrator is restrained in hand-ties on Thursday,
A demonstrator is restrained in hand-ties on Thursday, July 27, 2016, during a march through Manhattan to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Timothy A. Clary)
A demonstrator is restrained on Thursday, July 7,
A demonstrator is restrained on Thursday, July 7, 2016, during a march through Manhattan to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Timothy A. Clary)
A demonstrator, surrounded by NYPD officers, marches along
A demonstrator, surrounded by NYPD officers, marches along Seventh Avenue in Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Timothy A. Clary)
Demonstrators raise their arms during a march through
Demonstrators raise their arms during a march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
Demonstrators raise their arms with a chant of
Demonstrators raise their arms with a chant of "Hands up, don't shoot," during a march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
Demonstrators raise their arms during a march through
Demonstrators raise their arms during a march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
Demonstrators shout during a march through Manhattan on
Demonstrators shout during a march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
A demonstrator raises her arms during a march
A demonstrator raises her arms during a march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
Demonstrators march through Manhattan on July 7, 2016,
Demonstrators march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
Demonstrators march through Manhattan on July 7, 2016,
Demonstrators march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
Demonstrators let their signs do the talking during
Demonstrators let their signs do the talking during a march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
Demonstrators march through Manhattan on July 7, 2016,
Demonstrators march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. The sign lists some of the others also killed by police. (Credit: Getty Images / Yana Paskova)
Shouts and signs do the talking as demonstrators
Shouts and signs do the talking as demonstrators march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
NYPD officers were out and about as demonstrators
NYPD officers were out and about as demonstrators marched through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
A sign states the cause as demonstrators march
A sign states the cause as demonstrators march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)
A demonstrator's sign states her cause during a
A demonstrator's sign states her cause during a march through Manhattan on July 7, 2016, to protest the deaths of two black men at the hands of police in Louisiana and Minnesota. (Credit: Getty Images / Yana Paskova)