Two men were stabbed Sunday while watching a horror movie at a California movie theater.

The men were injured around 7:30 p.m. at the AMC Fullerton Town 20 theater in Fullerton, Calif., while watching the thriller "The Signal," MyFOXLA.com reports.

Police said the individuals were sitting in different parts of the theater when they were attacked by an unknown assailant, the station reports.

"He started stabbing at the theater seat and then he stabbed the victim," Fullerton Police Lt. Tom Basham said. "As he fled, he stabbed another victim sitting near the exit."

Police were called to the theater after someone found a bag of what appeared to be illegal substances, MyFOXLA.com reports. When officers arrived, moviegoers — including the bloody stabbing victims — were running out of the theater.

Authorities believe the assailant was a white male, who bought a ticket to the theater but was later asked to leave.

"He somehow made his way back into the theater," Basham told MyFOXLA.com.

Sgt. Jason Schoen described the suspect as a heavyset white man with black hair in his late to mid 20s.

In "The Signal," a transmission invades cell phones, radios and TVs, turning people into killers.

The film was paused Sunday night while police investigated the incidents. When it was restarted, Basham said, the first scene was a stabbing.

No arrests have been made in the case, Schoen said Tuesday morning.

Click here to read the full report at MyFOXLA.com.

The Associated Press contributed to this report.