The gunman who killed 49 people at an Orlando gay nightclub Sunday sent a text message to his wife during the rampage, asking "do you see what's happening?" a source close to the family told NBC News Thursday.
The texts between Omar Mateen and his wife, Noor Zahi Salman, during the attack on the Pulse nightclub were first reported by CNN. Mateen, 29, was later killed in a shootout with police.
The source close to Salman said Mateen's mother called Salman at around 2 a.m. Sunday, waking her up and asking if she knew where Mateen was.
Salman said she did not know, and texted her husband: "Where are you?" the source said.