SPOKANE, Wash. -

The FBI has joined the investigation into who made an improvised explosive device that was found by police while executing a felony arrest warrant.

Wednesday around 5:20 p.m., Spokane police received a tip that 25-year-old Michael J. Pauckert was in a north Spokane duplex on the 1400 block of Alice Avenue. Pauckert was wanted for a felony parole violation for  first-degree rape out of Idaho.

Police were told that Pauckert was with his girlfriend and a child, and he was armed with a handgun.

When police tried to contact Pauckert at the duplex, he refused to come out. His girlfriend and the child were out by the time officers arrived. After negotiating with officers for an hour and a half, he surrendered peacefully.

During the arrest, officers found a suspicious device in the garage of the duplex.

Spokane's bomb squad arrived on the scene and determined it was a legitimate improvised explosive device.

Neighbors on either side of the residence were evacuated.

A robot was used to detonate the IED around 5:30 a.m. Thursday.

Police don't know who made the bomb.

Bomb technicians and the FBI will continue investigating the scene and determine additional charges.