Parser overload, round 2

Grenade Found Inside Houston Police Headquarters

A live grenade was found inside Houston police headquarters near downtown on Thursday, a source told KPRC Local 2.

Officials said the grenade was discovered in the accident division at 61 Riesner near Lubbock at about 4:30 p.m.

Part of the building was evacuated as a precaution.

Investigators said the grenade was inside a duffel bag that was confiscated from an aggravated robbery suspect whose vehicle was impounded.

The grenade was described as inert and not considered dangerous.

Underlines added by me… How can a grenade be both live, and inert and not dangerous, at the same time?