A Muslim leader in Alabama says he's notified the FBI after mosque members received suspicious contacts on social media.

President Ashfaq Taufique of the Birmingham Islamic Society said Wednesday several members received friend requests from an unknown person.

Taufique says one member then got a message from the same person stating: "We are at war and we must stick together."

Taufique says the meaning of the message is unclear, but he told the FBI since it could be tied to extremism. He says the messages were sent before the mass shooting in California that's being blamed on a radicalized Muslim couple.

The FBI in Birmingham declined comment.

Taufique says it's part of his religious duty to report anything that could endanger the community.