The FBI were serving a warrant related to explosives at the time, according to officials.

COURTESY PHOTO: WCSO - Washington County sheriff's detectives say a 26-year-old man is suspected of setting off an explosive device during an Oct. 11 traffic stop on 185th Avenue.A man and a Washington County Sheriff's Office detective were injured on Wednesday after the man allegedly detonated a small explosive device during a traffic stop in Rock Creek.

According to FBI spokeswoman Beth Anne Steele, federal agents were serving a search warrant at an apartment complex on Northwest Rock Creek Circle on Wednesday afternoon.

According to a bench warrant issued on Oct. 11, the FBI learned in September that resident Jason Schaefer was buying "numerous items that were causing concern" including explosive liquid, remotes to remotely set off fireworks, more than 100 electric matches and at least a pound of hexamine, which can be used to make home-made explosives and is frequently used in suicide bombings.

SchaeferSteele said agents learned that he did have explosives that could be detonated remotely, giving authorities probable cause to arrest him on the charge of felon in possession of explosives.

As agents searched, a Washington County sheriff's detective spotted Schaefer driving on 185th Avenue. Schaefer didn't stop and a brief vehicle pursuit ensued. The man was stopped on Northwest 185th Avenue just south of Rock Creek Boulevard.

As the detective approached Schaefer's driver's side window, authorities said Schaefer detonated a small, handheld explosive device.

"In terms of size and intensity, it was a significant blast," Bob Ray with the Washington County Sheriff's Office said.

Schaefer and the detective were injured in the blast.

According to Ray, the detective was was treated and released from a local hospital.

Schaefer's injures were non-life-threatening, Ray said. He will be booked into the Washington County Jail after he is released from the hospital.

Schaefer, 26, is charged with a probation violation.

In May 2017 Schaefer pleaded guilty to charges of being a felon in possession of body armor in Washington County and was sentenced to 18 months supervised probation and mental health treatment.

This story will be updated with more information as it becomes available.

KOIN 6 News contributed to this report.

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