Orlando shooter texted wife during attack, source says

(CNN)The Orlando shooter and his wife exchanged text messages during the Pulse nightclub rampage, a law enforcement official briefed on the investigation told CNN.

Around 4 a.m. on June 12, about two hours after he started the attack and while holed up in a bathroom, Omar Mateen texted his wife, Noor Salman, asking if she'd seen the news, the official said.

At one point, she responded with a text saying that she loved him. Salman also tried calling her husband several times during the standoff, a second law enforcement official said.

The timing of her calls came after reports of the attack had emerged, and apparently after she realized her husband might be responsible. He didn't answer, the official said.

Salman is coming under increasing scrutiny as police investigate the killing of 49 people and wounding of at least 50 at the gay nightclub in Orlando. Authorities say Mateen carried out the killing with a Sig Sauer MCX semi-automatic assault-style rifle and a pistol.

Salman apparently gave conflicting accounts about what she knew of Mateen's intentions in the hours before the attack. authorities said. She also told investigators that in the weeks before the attack, Mateen spent thousands of dollars, including for the guns used in the attack.Mateen and Salman married in 2011. They have a 3-year-old son and lived in Fort Pierce, about two hours from the massacre.

A U.S. attorney plans to bring evidence before a federal grand jury to determine whether charges will be filed, two law enforcement officials said.Mateen also vented on Facebook before and during the massacre.

"America and Russia stop bombing the Islamic state," the gunman wrote, according to the chairman of the Senate Committee on Homeland Security and Governmental Affairs.

"You kill innocent women and children by doing us airstrikes ... now taste the Islamic state vengeance."

Then, in his final post, an ominous warning: ''In the next few days you will see attacks from the Islamic state in the usa."The messages were described in a letter from committee Chairman Ron Johnson to Mark Zuckerberg, asking the Facebook CEO to provide "all Facebook data on Mr. Mateen's activities on his account and any affiliated Facebook accounts."

It's not the only time Mateen invoked ISIS during his rampage early Sunday. In the middle of killing 49 people, Mateen also called 911 to pledge allegiance to the terror group and CNN affiliate News 13 to say, "I did it for ISIS. I did it for the Islamic State."

And an analysis of Mateen's electronic devices showed searches for jihadist propaganda, including videos of ISIS beheadings, an official said.