ISLAMABAD, Jan. 8 (Xinhua) -- At least 20 people, including two policemen, were killed in a suicide attack on the base of an outlawed militant group and incidents of firing in Pakistan on Friday, officials said.

    A bomber exploded his device stripped on his body in the officeof Lashkar-e-Islam group in Khyber tribal agency of northwest Pakistan, officials said.

    The attacker struck members of the group when they were entering mosque in the base, they said. Five people were killed and five others were injured, a leader of the group Qari Minhaj said.

    Minhaj said that three children and a passerby were among those killed in the attack.

    In another bomb attack two people were killed and two others were injured in a roadside bomb blast in nearby Bajaur tribal region. A vehicle was hit by the bomb at Charmang area, an official said.

    In the southwestern city of Quetta, unidentified gunmen shot dead two police of an investigative agency on Friday, police said.

    The members of Crimes Investigation Department came under attack when they were coming from night duty. No group claimed responsibility for the attack.

Pakistani security personnel are engaged in rescue operation at the site of explosion in the southern city of Karachi, Jan. 8, 2010

In Karachi, five people were killed in firing in Liyari locality of the port city, police said.

    Unidentified motorcyclists opened fire at the people after funeral procession for seven persons who were killed in the city on Thursday, police said.

    Also in Karachi in early Friday morning, six people were killed and several injured in an explosion near a mosque in Baldia Town of the commercial center.