The Pakistani army has launched what it calls a "comprehensive operation" to wipe out Islamist militants in the North Waziristan region.
It follows last week's attack on an airport in the city of Karachi, for which the Pakistan Taliban claimed responsibility.
An air strike on militant bases last night was claimed to have killed about 100 militants, many of whom are thought to have been foreign fighters.
"Our valiant armed forces have been tasked to eliminate these terrorists regardless of hue and colour, along with their sanctuaries," the army said in a statement.
More top news
An astronaut has set off for NASA's first year-long mission to the International Space Station - leaving his identical twin back on Earth.
Taking money from the rich to give to the poor is a debate as old as Nottingham's mythic son, so why are people still so divided on welfare?
An unsettled weekend of weather is in store as conditions turn wet and windy from the west tonight.