The teen hackers who infiltrated the email account of CIA Director John Brennan said they are prying into the accounts of other government officials, most recently claiming to hack an email account of FBI Deputy Director Mark Giuliano.

The group, which calls itself “Crackas With Attitude” and is under investigation by the FBI, has bragged about its exploits on Twitter. One member, called Cracka, sent screen shots of the alleged hack to Motherboard and claimed to have called a mobile number belonging to Giuliano and was told by a male, presumably the FBI official, “you better watch your back.”

The young hacker told Motherboard that the group took aim at Giuliano because the FBI has them under investigation.

“We didn't target him for anything interesting, we targeted him because FBI are [sic] investigating us,” the publication quoted Cracka as saying.