PESHAWAR (AFP) - The death toll in the US drone strike in North Waziristan has risen to six, security officials said on Wednesday. A US drone attack targeted a compound owned by Zamir Khan, a local tribesman, and used by militants. Two missiles were fired, a security official told AFP on condition of anonymity. Four people were killed, the official said. The strike took place at the village of Tapi, in the district of North Waziristan about 20 kilometres of Miranshah. Another intelligence official confirmed the first attack and said another US drone fired a third drone into the same compound killing, another two suspected militants and bringing the overall death toll to six. The identities of the dead were not immediately clear, nor whether they included any high-value targets.