Eleven people, including a child, were killed in a wave of bombings and ambushes in Afghanistan Thursday, authorities said, as the embattled nation''s allies pledged more support.

In one of several bombings blamed on Taliban insurgents, a roadside bomb destroyed a police vehicle near the southeastern border with Pakistan and killed five policemen, their commander said.

The bomb was in the Shorabak district of Kandahar province, said the border police commander for southern Afghanistan, General Saifullah Hakim. Two other policemen were wounded, he said.

Border police were also attacked in the eastern province of Khost, which also adjoins Pakistan.

Taliban insurgents attacked a police convoy overnight, sparking a clash, provincial border police chief Shair Ahmad Kochai told AFP.

"Two border policemen were killed in the Taliban attack," he said. Fifteen suspected militants were rounded up afterwards, he said.

In Kandahar city, meanwhile, a bomb fixed to a motorbike exploded Thursday outside the gates of a private construction company, said police officer Ghulam Mohammad.