The Walther P99, the same pistol said to be used by two robbers in Menglembu last month. (1ZOOM.ME pic)

IPOH: Police have launched an internal investigation into a claim that robbers used a police pistol during a robbery at a hotel in Menglembu here last month.

Perak police chief Razarudin Hussain said an initial investigation found that the pistol was reported missing by a police corporal in Tanjung Rambutan on Jan 15.