At a press conference on Friday morning, Dallas police chief David Brown described statements one of Thursday’s attackers made to negotiators before he was killed. Update (11:15 am): CBS News has identified the suspect as 25-year-old Micah Xavier Johnson, of Mesquite, Texas, a Dallas suburb.

Mark Hughes, the brother of protest organizer Cory Hughes, has been released from police custody after being identified as a suspect in Thursday night’s shootout in Dallas. “I just got out of the interrogation room for about 30 minutes with police officers lyin’, saying they had video of me shooting,” he told CBS DFW, “which is a lie.”

Authorities say they believe the attack in Dallas that killed five police officers and injured six more was carried out by at least four snipers who positioned themselves in “triangulated locations” on rooftops near the end of a Black Lives Matter parade route Thursday.