Washington: At least two police officers were shot during a protest against police racial bias in downtown Dallas Thursday afternoon, local media reported.

An officer at the scene said at least two officers had been shot, but that their conditions were unknown, KDFW television reported.

The station quoted another police source as saying at least three to six officers were shot, again without saying how seriously they were wounded.

Police said one suspect was ‘down’ and a second possible suspect was in a downtown parking garage wearing a bulletproof vest and tactical gear, the station reported.

The protests were part of demonstrations taking part in several cities against the fatal police shootings of African-American men in Minnesota and Louisiana this week.

Several hundred people attended the Dallas rally, which ended just before the shots rang out around 9 pm (0200 GMT Friday), reports said.

Witnesses reported hearing dozens of gunshots that sounded like semi-automatic rifle fire. ‘The shots were coming from the roof,’ a protester told KTVT television.

Video posted on the internet showed protesters marching when the shots rang out, scattering the crowd.

It was unclear whether any protesters had been hit.

Police warned protesters to flee the area, saying the scene remained an active-shooter situation.

SWAT teams were deployed to the scene, reports said.