Kabul, Afghanistan (CNN) -- Insurgents killed six Afghan civilians and wounded three more in improvised explosive device attacks in Afghanistan on Wednesday, NATO's International Security Assistance Force said Thursday.
Four civilians were killed and three wounded in Zabul province in the south and two died in Nimroz province in the southwest.
Improvised explosive devices, which are homemade bombs, have been the weapon of choice for insurgents in Afghanistan.
ISAF said the United Nations has reported that incidents involving IEDs "increased by 94 percent within the first four months of 2010 compared to the same period in 2009."
"ISAF remains committed to its mission to partner with the Afghan security forces to protect the Afghan people," said Col. Rafael Torres, an ISAF spokesman said.
"Eliminating the indiscriminate IED threat to civilians and military forces is a key focus for our operations."