Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Suspected US Drone Strike Kills 12 Pakistan's South Waziristan Attacks in Pakistan's southern Shaktoi area have become a source of friction between the U.S. and Pakistan, which sees them as a violation of its sovereignty VOA News 17 January 2010 Undated handout photo provided by U.S. Air Force shows MQ-9 Reaper, armed with GBU-12 Paveway II laser guided munitions and AGM-114 Hellfire missiles Photo: AP Undated handout photo provided by U.S. Air Force shows MQ-9 Reaper, armed with GBU-12 Paveway II laser guided munitions and AGM-114 Hellfire missiles Pakistani officials say a suspected U.S. drone missile strike has killed at least 15 militants. Authorities say the toll could rise. Sunday's attack took place in the Shaktoi area of Pakistan's restive South Waziristan region. The pilotless drone strikes are a source of friction between the United States and Pakistan, which sees them as a violation of its sovereignty. But Washington says they are an effective weapon in remote tribal areas. Pakistani Taliban militants issued a new audio recording Saturday they said proved their leader, Hakimullah Mehsud, survived a suspected U.S. missile strike earlier in the week. Pakistani intelligence sources had said Mehsud was wounded in the missile strike that killed at least 12 suspected militants. The United States has increased attacks using pilotless drones since a suicide bomber killed seven U.S. intelligence agents in eastern Afghanistan in late December. Some information for this report was provided by AFP and Reuters. .