Kabul, Aug 25 (DPA) More than 30 people were killed and at least 56 wounded when a car bomb targeting an international aid organisation in southern Kandahar province rocked the city Tuesday, officials said.

'At this time I can say that more than 30 people were killed and more than 56 others were wounded in today's explosion,' Zelmai Ayoubi, a spokesman for the provincial governor said.

He said most of the victims were civilians as dozens of civilian homes were destroyed in the attack.

Ayoubi said the attack, which is believed to have been carried out by car bomb, was against a office of the Canadian International Development Agency (CIDA). Officials from CIDA were not immediately available for comment.

According to witnesses, the attack was near a building that houses the country's secret service. Shots were also heard following the explosion.

On Tuesday, the first results were being announced for the country's presidential election, against which the radical Islamist Taliban had called a boycott.