Five years after the murder of BSP MLA Raju Pal, police have arrested one of the key accused in the case and recovered the weapon allegedly used in the killing.

On a tip-off, the special operations group of the local police arrested Gufran, a close aide and alleged sharp-shooter of mafia don-turned-MP Atiq Ahmed, from the Colonelganj police station area of the city late Sunday night, police sources said on Monday.