A gunman fired at a Dallas immigration field office on Wednesday, killing one detainee and critically wounding two more, before killing himself in what authorities called an indiscriminate attack on US Immigration and Customs Enforcement (Ice).Here’s what we know about the attack so far:

One detainee has been killed, with two others in critical condition. The Department of Homeland Security (DHS) said previously that two detainees had been killed and one injured, but issued a corrected statement. The Dallas police chief, Daniel Comeaux, said that the FBI is investigating the incident as an act of targeted violence. The shooter died from a “self-inflicted gun wound”, according to the DHS secretary, Kristi Noem.

The DHS said no members of law enforcement were hurt in the attack. But Comeaux also said that officials would not be releasing the identities of any victims at this time.

DHS officials say this was “an attack on Ice law enforcement”. At both today’s press conference and in a statement, law enforcement said that shell casings found near the shooter had “anti-Ice” messaging on them.

The shooter has been identified as 29-year-old Joshua Jahn, according to NBC News – which cited several senior law enforcement officials.