Eagles of Death Metal singer Jesse Hughes has revealed that Bono sent him a phone with a note telling him to call his mother the day after the Paris terror attacks.
The US rock band were in the middle of a gig at the Bataclan theatre in the French capital when a large number of their fans were gunned down in the November 13 atrocity.
Eighty-nine people were killed at the concert venue out of a total of 130 murdered in bars, cafes and restaurants in the unprecedented shootings.
The band returned to Paris earlier this month to join U2 on stage during the last date on their iNNOCENCE + eXPERIENCE tour.
Speaking to Rolling Stone magazine Hughes has hailed the Irish rockers for taking care of them: "Bono knows that I'm a Christian, and he also knows I'm a mama's boy.
"The very next day (after the attack), a courier came with a phone that had a note that said: 'This is from Bono. Make sure you call your mom.' I thought that was awesome.
"It was the first time that I really got to talk to my mom without being in a police station, and that meant the whole world to me at that moment.
"Then Bono called because I needed advice. I felt like the best person to ask for advice on how to deal with this is someone who's rubbed elbows with world leaders. And he just prayed with me on the phone."
Explaining what it was like joining U2 on stage, Hughes told the magazine: "U2 were trying to make sure we didn't have something in us killed.
"They would have accomplished their goal if they had just performed the song with us. They didn't have to give us the stage for the last song. And they did. They took care of us completely."
The band, who escaped the bloodshed by hiding backstage in the Bataclan, have now called on fellow artists, irrespective of music genre, to cover their song I Love You All The Time.
They will donate all of the publishing income to guitarist Josh Homme's charity The Sweet Stuff Foundation.
The organisation is providing assistance to the families of the attack's victims.