A deadly blast shattered a period of relative calm in Afghanistan on Monday and the Taliban ordered fighters to resume operations against Afghan forces just two days after signing a deal with Washington aimed at ushering in peace.
No group immediately claimed responsibility for the attack at a football ground in Khost in eastern Afghanistan, where three brothers were killed, officials told AFP.
The blast occurred around the same time the Taliban ordered fighters to recommence attacks against Afghan army and police forces, apparently ending an official "reduction in violence" that had seen a dramatic drop in bloodshed and given Afghans a welcome taste of peace.
The partial truce between the US, the insurgents and Afghan forces lasted for the week running up to the signing of the US-Taliban accord in Doha on Saturday, and was extended over the weekend.
"The reduction in violence... has ended now and our operations will continue as normal," Taliban spokesman Zabihullah Mujahid told AFP.
"As per the (US-Taliban) agreement, our mujahideen will not attack foreign forces but our operations will continue against the Kabul administration forces."
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