An ISIS-inspired teen planned a "detailed," attack against Pope Francis during his U.S. visit, according to joint intelligence bulletin by the FBI and Department Homeland Security obtained by ABC News.

The network reports the FBI "quietly arrested" the boy outside of Philadelphia last month for threatening to launch the attack on Pope Francis. The bulletin described by ABC says the teen obtained explosives and sent instructions on taking part in the attack through social media.

It said that's likely the case ouse Homeland Security Committee Mike McCaul mentioned when he disclosed authorities had disrupted an attack on the pope. But ABC also cited sources saying no threat was imminent and that there were questions about the boy's mental health.

The teen has been charged with attempting to provide material support to a terrorist organization and attempting to provide material support to terrorist activity, according to the report.

Louis C. Hochman is digital managing editor for Reach him at or on Twitter @LouisCHochman.