An Indian fighter jet takes part in a bombing exerciseRaveendran / AFP / Getty
From Time Magazine:
A purported midnight incursion of Indian air force jets into Pakistani airspace Saturday brought tensions between the two nuclear-armed neighbors to an even higher pitch in the wake of the attacks on India's financial capital of Mumbai that killed 171 last month. Within minutes, the Indian jets were chased back by the Pakistani air force, say Pakistani officials, and retired air force commanders interviewed on Pakistani TV swore to defend their nation. The Pakistani air force claimed that Indian planes intruded as much as 2 miles (4 km) into the country, but the government says it accepted Indian assurances that the incursions were inadvertent; the Indian government, for its part, denied publicly that an incursion took place at all. Pakistani President Asif Ali Zardari dismissed the incident at a joint press conference with British Prime Minister Gordon Brown on Sunday, calling it a "technical incursion — two planes flying 50,000 miles up in the air; when they turned, they slightly entered Pakistan soil." Brown was in Islamabad after visiting India and Afghanistan to discuss security in the wake of the Mumbai attacks.
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Update: Pakistan offensive shows slow success -- Yahoo News/AP