A provincial police chief said a suicide bomber on foot has struck inside a police training center in southern Afghanistan, killing 18 officers and wounding many others. Juma Gul Himat said the bomber entered the training center in Uruzgan province capital of Tirin Koton Monday. Himat is Uruzgan's provincial police chief. Himat said the blast wounded scores of other policemen, seven of them seriously. Several buildings were damaged. Southern Afghanistan is the center of the Taliban-led insurgency. The terrorists have made a comeback after being initially defeated in the US invasion in 2001.