European Union chief diplomat Catherine Ashton expressed condolences to Pakistan on Tuesday over a Nato air strike that killed 24 Pakistani troops and voiced support for an investigation. Ashton is closely following reports of the incident, her office said after Saturdays raid near the Afghan border, which prompted a furious Islamabad to cut off alliance supply routes to Afghanistan. High Representative Catherine Ashton has offered her deepest condolences to the government and people of Pakistan for the loss of life and injuries resulting from the incident along the Afghan-Pakistani border at the weekend, her office said in a statement. The EU official supports Pakistan and Nato efforts to conduct a full investigation, it said.