ANKARA, July 29 (Xinhuanet) -- An explosion rattled southern Turkey Thursday, causing no casualties, Anatolia News Agency reported.

    The bomb exploded in front of the Metropol Working Center at Hastane Street in Mersin Thursday morning, officials of local Security Directorate were quoted as saying.

    The explosion destroyed some car glasses and shop windows nearby, but no casualties were reported, the officials added.

    Late Wednesday night, a watchman was killed and another three, including two policemen, were wounded by a bomb attack in southeastern province of Diyarbakir, the agency reported.

    Unidentified assailants staged a bombing and armed attack on a police post in Mardinkapi district of Diyarbakir, leaving four wounded, Governor Nusret Miroglu confirmed, adding an watchman died of wounds later in the hospital.

    The authorities blamed the outlawed Kurdish Workers' Party (PKK) for the attacks.

    The PKK, also known as KADEK and Kongra-Gel, has been listed as a terrorist group by the United States for its killing of some 37,000 people in southeastern Turkey since 1984.

    The group sustained a major blow in 1999 when its leader Abdullah Ocalan was captured in Kenya, after which it announced a unilateral truce and pledged to renounce armed struggle.

    The group later retreated to mountain areas in northern Iraq with up to 5,000 armed militants.

    However, some 2,000 PKK members have returned to Turkey recently for attacks against Turkish military targets, announcing end of the unilateral truce and renewal of its separatist fight. Enditem¡¡