Pak naval bus attacked in Karachi, four killed**

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KARACHI, April 26: (AFP): Bomb attacks hit two buses carrying Pakistani navy officials in Karachi Tuesday, killing four people in the latest sign of rampant insecurity in a nation key to US hopes of quashing the Taliban. Nearly 60 people were wounded when remote-controlled bombs exploded beside the buses at rush hour in different parts of Pakistan's politically tense economic capital, used by NATO to ship supplies to troops in Afghanistan. Attacks on Pakistani security personnel are rare in Karachi and Tuesday's assaults come one day after leaked documents showed US investigators considered Pakistan's military intelligence agency to be a terrorist group. Officials said four people were killed in the attacks and the navy, which is based largely in Karachi, identified them all as its employees. "All the four dead were navy officials including a lady doctor, a sub lieutenant, a sailor and a civilian employee," navy spokesman Commander Salman Ali told AFP. "Fifty-seven people were injured in the two attacks and of them, 50 were navy officials," he added. Provincial government official Sharfuddin Memon told AFP that the first bomb was planted on a motorbike parked in the upmarket Defence Housing Scheme and the second hidden in rubbish in the impoverished Baldia town neighbourhood. Local intelligence officials said that the bombs were triggered by remote control near buses carrying naval personnel. There was no immediate claim of responsibility, but Taliban and other Islamist militants have attacked in Karachi in the past, although their near-daily assaults on security forces are mainly in the country's northwest. Bomb attacks have killed more than 4,200 people across the country since July 2007, and the United States considers Pakistan's northwestern border areas with Afghanistan the global headquarters of Al-Qaeda. Television footage of the scene of Tuesday's attack showed white navy passenger buses with smashed-out windows and the remains of a destroyed motorcycle, as security officials put pieces of wreckage into a sack and marshalled the rescue effort. Karachi is home to Pakistan's stock exchange and a lifeline for a depressed economy wilting under inflation and stagnating foreign investment. But the city of 16 million is plagued by ethnic and sectarian killings, crime and kidnappings. It is scored with rivalries between the Urdu-speaking majority and an influx of Pashtuns from the northwest, and outbreaks of political violence in Karachi killed more than 150 people last year.