At least 10 people were killed and 30 others wounded in the southern Afghan province of Kandahar when their truck hit a roadside bomb Tuesday. \"Ten dead, 30 injured have been sent to the hospital,\" said Abdul Qayoum Pukhla, provincial health director of Kandahar. The labourers were on their way to work when the blast struck in the rural Panjwayi district of Kandahar province. No group has said it carried out the attack. Last week gunmen shot dead 35 highway workers in Paktia province. Road workers are frequently targeted by Taliban militants. The Taliban recently declared a \"spring offensive\" of attacks. This is the fourth attack in as many days. Kandahar is considered to be the spiritual homeland of the Taliban. Earlier this month the city effectively came under siege as insurgents attempted to seize control of several government buildings. There are also frequent attacks on security forces, both foreign and Afghan, operating across the province.