OLYMPIA (AP) – Four people were taken to the hospital as a precaution after a suspicious substance was found in an envelope sent to the Washington state Capitol.

The second floor of the Jefferson Building in Olympia was evacuated about 10 a.m. Monday.

The building houses several Washington state agencies.     Its HVAC system was secured as investigators from the State Patrol SWAT team and a support team from JBLM arrived to investigate.

The woman followed a self-decontamination procedure after discovering it while she was wearing gloves.