SAN MARINO — Four suspects who attacked a man during a home invasion robbery in San Marino were on the loose Wednesday and an investigation was underway.

San Marino Police Department officers were called to the 2900 block of Duarte Road, near San Gabriel Boulevard, around midnight Wednesday morning after the masked intruders entered the home and stole several items, according to the department.

The victim reported he was at home when the suspects entered through an unlocked front window by forcibly removing the screen. He said he was clobbered on the head and left arm with a blunt object while a second suspect brandished a pistol and demanded cash, according to San Marino police.

The man was taken to a hospital for treatment and later released.

Home surveillance video of the suspects, who emerged from an unidentified car, showed they were dressed in dark clothes and hoodies with face coverings and gloves. They were in the home for about seven minutes and exited through the same window they entered, but not before ransacking several bedrooms, police said.

The man reported that jewelry and a watch were taken.

A Los Angeles Sheriff’s Department crime scene technician was called in to collect evidence as San Marino Police Department detectives investigate.

Anyone with information that could help identify the suspects was urged to call San Marino police at 626-300-0720.