An Adams County, Colo. police officer who was shot in Thornton on Wednesday night has died, and a manhunt was underway for as many as two suspects, reports said.

One suspect was in custody, Denver7 News reported, citing a law enforcement source.

“Officer down, please avoid the area of 88th and Dawston Street,” the Adams County Sheriff’s Office tweeted. “Large perimeter with suspect still at large.”

The tweet advised residents in the area to “seek shelter away from the doors and windows.”

In a follow-up tweet, the department described a “large dangerous scene with active searches in progress.”

Some residents reported a tense scene in the community in the immediate aftermath of the shooting, with SWAT teams searching for a suspect.

“Officers walking around with rifles drawn,” a reporter posted on Twitter. “Deputy just told us ‘guys careful I was just pointing my rifle at you thinking you had a gun.'”

A Walmart employee near the shooting reportedly told reporters that doors at the store were locked as the manhunt continued.

Last Wednesday, an Adams County deputy fatally shot a man who fought with him in an apartment complex, police said.