A senior Libyan police officer was gunned down in capital Tripoli on Tuesday, a local security source has said.Gen. Mohamed al-Senussi, head of the Tripoli Security Directorate, was shot dead by unidentified gunmen in the city's Tagoraa district, the source told Anadolu Agency.There has been no claim of responsibility for the attack.Libya has recently seen heavy fighting between a loosely organized national army and local militias that held onto their weapons following a bloody 2011 uprising that ended with the ouster and death of long-serving ruler Muammar Gaddafi.Tripoli in particular has witnessed fierce clashes between warring militias over control of the city's strategic facilities.