Hawaii County police have arrested a suspect in the case of a Hawaii island woman and girl who were kidnapped, threatened and sexually assaulted Tuesday in the ­Piihonua area.

Police said the victims didn’t know the man, but declined to say whether the victims are related to each other.

Police arrested the 36-year-old Puna man at 8:20 p.m. Wednesday on suspicion of 42 offenses related to the sexual assault.

The man was already in police custody on a separate case.

The perpetrator, who spoke pidgin, approached the woman and the girl sometime between 1 and 4 p.m. Tuesday in the area of the Piihonua bridge, police said.

He took them to a remote area and sexually assaulted both of them.

Police had put out an alert for the suspect, described as having a dark complexion, between 5 feet 7 and 5 feet 8 inches tall, and weighing about 200 pounds with a medium build and a “beer belly.”

He was unshaven, had short black hair, a black mustache and hazel eyes.

Police initially arrested the man earlier Wednesday on a warrant in a 2011 marijuana case.