Officials in Grants Pass have determined that several hand grenades found outside of a McDonald’s earlier this week were live, authorities said Thursday.

On Tuesday, police responded to reports of suspected explosives in the landscaping of the restaurant near the corner of Northeast 7th Street and Northwest Morgan Lane. Officers found what appeared to a hand grenade near the driveway of the business and called for help from the Oregon State Police Explosive Unit, who discovered three more devices in the dirt nearby.

On Wednesday, experts examined the grenades and determined that three of the four were live explosives.

The area where the grenades were found was searched at the time of the initial discovery, officials said, but police returned to do a more thorough check after it was determined the devices were live.

“Currently we are in the process of checking the entire area more thoroughly for any other potential devices,” the Grants Pass Department of Public Safety said in a statement. “We do not have any indicators of additional devices or threats, this is strictly a precautionary measure in an effort to ensure the safety for those who will be working in the area.”

Officials also asked the public to contact law enforcement if they encounter anything that looks suspicious.

-- Kale Williams

kwilliams@oregonian.com

503-294-4048

@sfkale

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