Muslim killer was in touch with several terror subjects while overseas

…Syed Rizwan Farook, who killed 14 people in San Bernardino during a shooting rampage with his wife, was in contact with more than one international terrorism subject whom the FBI was already investigating, a law enforcement source told The Post.

“He was in touch with others here that the FBI was looking at, and he very well could have been radicalized. But I’m not sure how major those other targets are,” the source said.

Other law enforcement sources told CNN that Farook’s apparent radicalization contributed to his motive, but that other things — like workplace grievances — also may have played a role.

He contacted the terrorism subject via social media and over the phone,…