HUNTINGTON BEACH (CNS) - Huntington Beach police in patrol cars, on  horseback and on foot arrested 39 people Saturday and 39 people Sunday during  the first weekend of the U.S. Open of Surfing, police said today.

The event spans two weekends with the grand finale this coming Sunday,  said Huntington Beach police Sgt. Kevin Johnson. A full compliment of officers  were expected for next weekend in hopes of preventing the post-event riot and  looting that happened last year.

Police also had a social media scare last Friday that led to a search of a Huntington Beach teen's home and his arrest for allegedly threatening to  harm crowds at the event, officials said.

``We did recover a handgun and a shotgun at the residence that appeared  to belong to the family. We're still conducting follow-up,'' Huntington Beach  police Lt. Mitch O'Brien said, adding the boy's electronic devices have also  been seized.

The boy was being held at Orange County Juvenile Hall.

The 39 arrests Saturday and 39 on Sunday were mostly for drunkenness and  disorderly conduct in the downtown area, Johnson said.

Qualifying rounds continue throughout the week, he said.