If you saw smoke and emergency vehicles around LaGuardia Airport on Saturday, don't worry, it was just a drill.

The Port Authority Police Department, FBI, Federal Aviation Administration, federal Transportation Security Administration, NYPD, FDNY and the Red Cross took part in a full-scale security drill that tested LaGuardia's emergency plan.

The exercise ran from 10 a.m. until 1 p.m., but wasn't expected to affect flights into and out of the Queens airport, Port Authority said in a news release.