Uttar Pradesh Police's Special Task Force (STF) has arrested the brother-in-law of gangster-turned-politician Atiq Ahmad for sheltering and providing money to the killers of Umesh Pal -- the key witness in the murder case of BSP MLA Raju Pal.

Akhlaq Ahmad, a government doctor, was arrested from Nauchandi area here by an STF team on Saturday night and taken to Prayagraj, said Superintendent of Police, STF, Brijesh Singh.