CLAYMONT, Del. — A University of Delaware student was arrested after police found a handgun, ammunition and written plans for an attack in his vehicle that included references to “martyrdom” and named a campus police officer as a target, authorities say.

Luqmaan Khan, 25, had a notebook containing writings about “urban warfare,” according to an FBI complaint filed in the case. A later search of his home turned up a scoped rifle, body armor and a handgun modified with an illegal machine gun conversion device known as a “switch,” the complaint said.

Khan has been in federal custody since his arrest on Nov. 24 at Canby Park West in Wilmington, when he was stopped by New Castle County police. Authorities said he was parked unlawfully and that he appeared nervous and was uncooperative when co

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