GARDEZ (Afghanistan), June 20: A Taliban suicide bomber rammed his motorbike into an Afghan-Nato patrol in the town of Khost on Wednesday, killing 21 people, including three Nato soldiers, officials said.

Another 37 people were wounded in the blast in the eastern town close to the border with Pakistan, hospital officials said. It was the second major attack on Nato in Khost in three weeks. The government blamed the Taliban and a spokesman for the militia later claimed responsibility for the attack.

The bombing will only heighten fears about security as Nato prepares to hand responsibility to Afghan forces and pull out the vast majority of its 130,000 combat troops by the end of 2014.

The Taliban, leading a 10-year armed campaign against the western-backed government, have begun their annual fighting season with a series of attacks that forced US Defence Secretary Leon Panetta to admit that violence was rising.

Interior ministry spokesman Sediq Sediqqi said Wednesday’s blast targeted a combined Afghan and coalition patrol passing through Khost, one of the most troubled parts of Afghanistan.

The Haqqani network, a militant group close to Al Qaeda and blamed for some of the most daring attacks in Afghanistan, is particularly active in the region.

Amir Padsha, the director of Khost city hospital, said the bodies of three police officers and eight civilians, along with 17 wounded were brought in.

Babri Gul, the head of the Babri Gul private hospital in Khost, said he had received six bodies, including four members of the same family, and 20 wounded.

The US embassy in Kabul released a statement confirming that three members of the US-led Nato mission and an Afghan interpreter were killed. An Isaf official said the three personnel were soldiers.

Afghan police and interior ministry officials confirmed that the four dead announced by the Americans were in addition to the 17 Afghan bodies taken to local hospitals.

A Taliban spokesman said by telephone that one of its fighters blew himself up alongside a US military patrol in Khost, killing 10 American soldiers, including a translator, and four Afghan policemen.

In Khost on June 1, a suicide truck bomber targeted a US-run base in an incident that killed up to 15 people. US media reported that more than 100 American troops were treated for injuries after that blast.

For the past five years the number of civilians killed in the war has risen steadily, reaching a record 3,021 in 2011 — the vast majority caused by militants, according to UN figures.—AFP