The United States army is investigating the disappearance of "sensitive" equipment at a joint army and air force base in Washington state.

The New Tribune of Tacoma said on its website on Sunday that a 100-member infantry company has been locked down at Joint Base Lewis McChord while the investigation is carried out.

Matt Hinkle, the base spokesman, said the company under investigation is from the 4th Brigade, 2nd Infantry Division.

Major Chris Ophardt, spokesman for 1 Corps, said the missing items are weapons accessories and not weapons. Laser sights were cited as an example.

Ophardt said the lockdown started on Wednesday and will continue until the probe is over. Meanwhile, the company is restricted to barracks and dining areas but families can visit.

A $10,000 reward has been offered for information leading to the equipment's return.

Source: AP