A protester with a Tibetan flag set himself on fire outside the United Nations headquarters in Manhattan on Thursday evening, according to sources.

The man was captured on UN surveillance footage planting the flag on a sidewalk at East 43rd Street and First Avenue before self-immolating around 7 p.m., the sources said.

An apparent protester set himself on fire outside New York City’s United Nations headquarters on Thursday. William C Lopez/NY Post

The incident occurred at 42nd Street and First Avenue, where an NYPD officer is seen holding a sign reading “China Out of Tibet.” William C Lopez/NY Post

Sources said the man lit himself on fire around 7 p.m. David Deturris/ for NY Post

The protester was taken to Bellevue Hospital in grave condition. William C Lopez/NY Post

The Tibet flag was still on display about an hour after the shocking incident occurred. William C Lopez/NY Post

He was taken to Bellevue Hospital in grave condition.

The flag was still in place about an hour after the shocking display as cops investigated the scene.

This is a developing story. Please check back for updates.