WASHINGTON (AFP) - US President Barack Obama on Tuesday spoke to Afghan President Hamid Karzai, for what officials said were regular consultations, three days after a Nato air strike killed 11 Afghan children. The White House announced the conversation, but would not divulge whether Obama mentioned the strike, which caused the latest of a string of civilian losses that have greatly angered Karzai and tested his relations with Washington. A White House statement said the leaders discussed the security transition from NATO to Afghan forces and Afghan-led peace and recognition efforts.