Straphangers faced major subway problems Thursday morning after an unstable building façade was reported in the Bronx.

Firefighters spent several hours monitoring the building at 1232 Southern Blvd. near Freeman Street, the FDNY said.

The scene has since been cleared and no injuries were reported, an FDNY spokesperson said.

Service on 2 and 5 trains was heavily impacted during the morning commute, but both lines have since resumed, though delays persisted for several hours, the MTA said.

A Department of Buildings spokesperson said there was no immediate danger of collapse at the building, but that a bowing condition had been observed. The investigation is ongoing, the spokesperson said.