Abdul Razak Ali Artan, 18, wrote on what appears to be his Facebook page that he had reached a “boiling point” and made a reference to “lone wolf attacks.”

“America! Stop interfering with other countries, especially Muslim Ummah (community). We are not weak. We are not weak, remember that,” the post said.

Two hours before that, a cryptic post on the page said: “Forgive and forget. Love.”

Officials cautioned that they have not determined a motive for the Monday morning ambush, which sent 11 people to the hospital.