The death toll from a suicide bombing in southern Afghanistan on Tuesday night which ripped through Kandahar city, the provincial capital of Taliban birthplace Kandahar province, rose to 10, bringing the death toll to 15 in a single day's three attacks, the provincial government said Wednesday.

"The casualties from a suicide bombing in Chaok-e-Madad or Sardar Madad Khan Square of Kandahar city rose to 10 including four civilians and six policemen," the provincial government said in a press release.

According to the release, a total of 15 people were injured in the attack when a suicide bomber blew his explosive-laden tricycle up in Chaok-e-Madad Tuesday night in the city, some 450 km south of capital city of Kabul.

It said the injured include eight civilians and seven policemen.

It appeared that some of the injured have died of their wounds in Kandahar hospitals since a spokesman for the provincial government Daud Ahmadi late Tuesday told Xinhua that six people were killed and 19 others were injured in the attack, the third blast in the city in a single day.

Ahmadi said, initially, there was a small blast in the area, with no casualties, but as police forces arrived at the site and local people gathered at the scene another bomb was detonated that caused the casualties.

"I heard two loud explosions near my neighborhood, and now the roads nearby have been closed," a Kandahar resident named Hady told Xinhua.

Hours earlier, a policeman with Afghan Border Police and four children were killed and 16 others injured when a suicide bomber blew his explosive-laden motorbike up near a police checkpoint in first precinct of the city at around 12:30 p.m. local time Tuesday.

Taliban has claimed responsibility for Kandahar attacks.

Meantime, Afghan President Hamid Karzai and commander of NATO- led International Security Assistance Force (ISAF) in the country have strongly condemned the Kandahar attacks.

"The terrorists by launching coward and inhuman attacks in Kandahar one again showed that they do not want Afghan people to live in peaceful and prosperous environment in their country," Karzai said in a statement issued by his office.

"Once again, insurgents have needlessly brought tragedy and sadness to the families of those killed and injured in Tuesday's terrorist attacks," ISAF commander General John R. Allen was quoted in a press release issued by ISAF on Wednesday.

"Our prayers and condolences are with the families and loved ones of those civilians and brave Afghan National Security Force members killed and injured in these brutal attacks," Allen said, adding that "I condemn this senseless violence in the strongest of terms and vow that we will continue our relentless pursuit of the enemy, as the cowardly perpetrators of these heinous crimes must be held to account."

The Taliban-led insurgency has been rampant since the militant group announced to launch a rebel offensive from May 2011 against Afghan and some 130,000 NATO-led troops stationed in Afghanistan.

The Taliban outfit also warned the civilians to stay away from official gatherings, military convoys and centers regarded as the legitimate targets by militants besides warning the people against supporting government and foreign troops.

The recent attacks occurred in the same day when Taliban announced that they agreed to have an office in Qatar and hold dialogues for negotiated settlement of Afghan crisis.

"We are ready to have a political office overseas and in this regard we have reached preliminary understanding with Qatar and other relevant sides," the outfit said in a statement sent to media on Tuesday.