KABUL (AFP) The Taliban said Sunday they were behind an attack on NATOs main base in southern Afghanistan, the third on international forces in a week, showing their determination to meet fire with fire. As US and NATO troops escalate operations against the militants in their heartland of Kandahar province, the Taliban are making good on threats of a nationwide campaign against targets allied with the Kabul government. We attacked Kandahar air base with rockets last night, Yousuf Ahmadi, a Taliban spokesman, told AFP by phone from an undisclosed location. The attack in Kandahar was the third on international forces in a matter of days after a suicide attack in the capital on Tuesday and an attack on Bagram Airfield, about 60 kilometres north of Kabul, the following day. Seven hours of fighting at Bagram resulted in the deaths of an American contract worker and 16 militants, NATO said. Nine NATO soldiers were wounded. Earlier this month the Taliban announced a new nationwide campaign of attacks in Afghanistan, targeting diplomats, Afghan parliamentarians and foreign contractors, as well as foreign forces. Ahmadi said that one rocket landed near a shopping strip on the Kandahar Air Field (KAF), another near a helicopter landing zone. The attack had caused 'massive damage, he said, adding that the militants had killed 13 foreign soldiers and wounded many others. The Taliban regularly exaggerate the impact of their operations. NATOs International Security Assistance Force (ISAF) said there were no fatalities in the attack, which began around 8:00 pm (1530 GMT) on Saturday. A number of ISAF personnel and civilian workers have been injured and are receiving medical treatment. There are no confirmed fatalities, an ISAF statement said. A total of five rockets were fired into the base and a number of insurgents were attempting to enter the base on the north side. They were repelled by security forces, it said. KAF is the main base in the area for troops fighting the insurgency, which is concentrated in Kandahar. It houses around 23,000 personnel. The base regularly comes under rocket fire, when all personnel are ordered to take cover until an all-clear is sounded. KAF sits on the edge of Kandahar city, the provincial capital, where Taliban are digging in as US, NATO and Afghan troops build an operation aimed at squeezing the militants out of their traditional home. The attack came just hours after Britains new foreign minister William Hague met President Hamid Karzai in Kabul to discuss the security situation in Afghanistan, where Britain has 10,000 troops. Hague, accompanied by Defence Secretary Liam Fox and International Development Secretary Andrew Mitchell, said they had made clear to Karzai that Britain expected to see his government make progress to match the international strategy for ending the insurgency. We are urgently taking stock of the situation, but in the sense not of deciding whether to support that strategy but of how to support that strategy in the coming months and years, Hague told reporters. Britains military and aid commitment in Afghanistan is the second-biggest behind the US. There are currently 130,000 troops in Afghanistan fighting the Taliban insurgency under US and NATO command. The number of foreign troops is set to rise to 150,000 by August as part of a US-led counter-insurgency strategy aimed at speeding up the end of the war now well into its ninth year. Most of the fresh troops are being deployed to the southern hotspots of Kandahar and neighbouring Helmand province, and military planners say they hope to have eradicated the Taliban threat by the start of Ramazan in August.