A bomb exploded at an Internet cafe near a police station in Istanbul on Thursday, wounding at least three policemen and four civilians, officials said. There was no immediate claim of responsibility for the attack in the city's Bayrampasa district. The bomb went off at an Internet cafe frequented by police officers from the nearby local headquarters of Istanbul's riot police. Radical Islamic, Kurdish and leftist militants are active in the city. One of the wounded civilians was reported to be in critical condition. Al-Qaida-linked Turkish terrorists carried out a series of suicide bombings in Istanbul in November 2003, killing some 60 people.