Gunmen in Liberia are reported to have murdered the official charged with tackling corruption in public contracts.

Officials say Keith Jubah was killed last night outside his house, 37 miles from the capital, Monrovia.

The police have not yet said whether they believe the killing was related to Mr Jubah's position as head of the Public Procurement and Concessions Commission.

The commission ensures that contracts including major deals for mineral extraction rights are legitimate.

The commission screens and reviews all concession agreements involving both local and international investors and also scrutinizes government expenditures.