Investigators probing possibility of terrorism in Orlando shooting

A federal law enforcement official said the FBI is focusing on whether Orlando, Fla., nightclub shooting suspect Omar Mateen was inspired by Islamic extremists overseas, but say they have only just begun digging into his background and don’t want to jump to conclusions.

A second law enforcement official said it will become more clear in coming hours whether Mateen was inspired or directed to carry out the mass shooting, though the incident has the hallmarks of being a “lone-wolf” style attack.

—Del Quentin Wilber