Explosives similar to the kind Timothy McVeigh used in the Oklahoma City bombing were taken from a California home and disposed of Thursday morning, FOX40.com reports.

Probation officers were reportedly doing a routine probation check on Scott Williamson, of Manteca, Calif., on Dec. 9 when they discovered the explosives.

Williamson was not home at the time but his grandfather let officers inside the residence where they found the devices, according to the station.

The Manteca Bomb Squad removed the explosives and held them until Thursday's detonation.

The devices were reportedly taken to the Manteca Police Department's firing range and set off.

Officers are currently searching for Williamson, who has not been located or questioned since the explosives were found, the station reports.

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