PORTSMOUTH, N.H. (AP) — New Hampshire officials are continuing to focus on an area off Portsmouth’s Peirce Island in the search for the body of a slain University of New Hampshire student.

Senior Assistant Attorney General Jane Young said Tuesday that the crews of four Marine Patrol boats and a police dog trained to detect bodies are searching the waters off a lookout point on the island.

A 29-year-old Dover man has been charged with second-degree murder in the death of 19-year-old Elizabeth “Lizzi” Marriott.

She vanished one week ago, after telling family members she was going to visit friends in Dover.

Seth Mazzaglia was charged Saturday with strangling or suffocating her in his apartment on Oct. 9.

Young would not comment on how authorities know that Marriott was killed.