THE service revolver belonging to slain Police Sergeant Hayden Manwaring was found hidden behind an apartment building in San Fernando on Wednesday night.
A fourth suspect was detained in connection with his shooting death in the same apartment building near Lady Hailes Avenue, on Tuesday afternoon.
Investigators received an anonymous call that a black bag was discovered on Wednesday night.
A team of officers, accompanied by tracker dogs, went to the area and retrieved the black plastic bag, which contained Manwaring's service revolver.
The weapon was taken from Manwaring during a struggle with one of the suspects on Tuesday.
Manwaring and Police Constable Nicholas Phillip had learned of a robbery at a fast food outlet in San Fernando and found the suspects in a car at Padmore Street, San Fernando.
The officers approached the vehicle and Manwaring was pushed away, as the four suspects attempted to escape. One of the men grabbed his revolver.
Manwaring, a father of two, was shot in the stomach, while Phillip was shot in the right arm.
Manwaring collapsed inside the vehicle and the driver of the getaway car was ordered to drive him to the San Fernando General Hospital, where the driver was arrested by waiting officers.
A large contingent of officers responded and two men were arrested along Lady Hailes Avenue. One was injured in the shooting.
A fourth suspect was held in an apartment off Lady Hailes Avenue. The men range in age from 23 to 27.
The injured man was taken to the San Fernando General Hospital, where he remains under police guard, while the others were detained at the San Fernando Police Station.
No charges were laid up to last evening.
Police said the revolver would be tested to confirm if it was used to kill Manwaring and injure his colleague.