The shooting of two police officers in Ferguson, Missouri, during a protest rally sparked an intense manhunt on Thursday and ratcheted up tensions in a city at the center of a national debate over race and policing.

U.S. President Barack Obama and Attorney General Eric Holder condemned the attack on the men, who were treated at a local hospital and released, as law enforcement officers in tactical gear swarmed a home in the St. Louis suburb, looking for a suspect. Television images showed officers on the roof breaking into the attic with heavy tools.

Shawn McGuire, a St. Louis County police spokesman, said people were taken from the house but there have been no arrests so far. He would not confirm media reports that two men and a woman were led away.