Bombs explode in Istanbul before wedding of PM's son

ISTANBUL, Turkey -- A bomb exploded outside the office of Prime Minister Recep Tayyip Erdogan's political party Sunday, just hours before his son was to be married.

No injuries or damage were reported at the Justice and Development Party's office in Istanbul, and the Turkish news agency Anatolia reported it was meant to make noise rather than cause harm. Earlier, police found and safely detonated two more bombs in a bustling commercial neighborhood, Besiktas.

Police were on alert and looking for suspicious packages before Erdogan's son Bilal was to get married to Reyyan Uzuner in the city. About 10,000 people were expected to attend, including Italian Premier Silvio Berlusconi and Turkish Foreign Minister Abdullah Gul.

Some 5,000 police officers blocked streets near the wedding site in a convention center and sharpshooters were posted on nearby rooftops. Metal detectors were set up on streets near the site.

Police also detonated two other suspicious packages near the party building, but no explosives were inside, Anatolia said.

No one claimed responsibility for the bombs.

Militant Islamic, Kurdish, and extreme leftist groups are active in the city and have carried out attacks in the past.