The ethnic bloodbath in Pakistan's port city of Karachi has claimed at least 50 lives and left 80 others injured in three days,with Premier Yousuf Raza Gilani not ruling out the possibility of involvement of foreign elements in the widespread violence. The government was concerned about the violence and a detailed inquiry was being carried out to find out who was responsible for it,Gilani was quoted as saying by news channels. He said the Government could not rule out the involvement of a "foreign hand" in the violence. His remarks came when reporters asked him at the Multan airport whether he sees a foreign hand behind the incidents of arson,loot and violence in Karachi. "It can't be ruled out," Gilani replied. Media reports said that around 50 people have been killed and close to 80 injured in three days of violence in parts of the city which is blamed on ethnic clashes between the supporters of Urdu-speaking Mutthaida-e-Qaumi Movement and Pashtoon-speaking Awami National Party. The two parties are partners in the ruling coalition. The violence that broke out on Tuesday saw protesters burn vehicles and shops,with peace returning to the city on today as the people stayed indoors due to the May Day public holiday.