FILE- In this Jan. 23, 2012 file photo, Indian Air Force Mirage 2000 fighters fly in formation during the final rehearsal of Republic Day parade in New Delhi, India. Pakistan's military spokesman tweeted that Indian aircraft crossed into Pakistan on Tuesday and carried out an airstrike but said there were no casualties from the attack. The incursion could have been in retaliation for a deadly Feb. 14 suicide bombing in India's half of Kashmir that killed at least 40 troops. The Pakistan-based militant group Jaish-e-Mohammad claimed responsibility. (AP Photo/Saurabh Das, File)

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