Sri Lanka opposition leader Ranil Wickremesinghe speaks during a news conference in Colombo January 2, 2008. Tamil Tiger rebels bombed an army bus in Colombo on Wednesday killing four people and wounding 24, military and hospital officials said, the latest in a series of attacks as renewed civil war deepens. The attack came a day after prominent opposition Tamil parliamentarian T. Maheshweran was shot dead at a Hindu temple in the capital, a killing the opposition blamed on the government for failing to ensure his security. Wickremesinghe on Wednesday called on the government to increase security for lawmakers. REUTERS/Buddhika Weerasinghe(SRI LANKA)