At least four people were killed and a dozen others wounded when a bomb exploded at a top hotel hosting the Chinese ambassador in southwestern Pakistan, officials said late yesterday.
However, police said that initial investigation revealed that the explosive device was planted in a auto that was parked in the hotel's parking area.
The CTD and police have begun investigations into the blast and will ensure perpetrators are punished, he said.
He added that despite the security measures, the vehicle carrying explosives managed to enter the parking lot from the main gate of the hotel, which is a matter of big concern and the people responsible will be taken to task for a security lapse. Footage on Pakistan news channels showed burning cars.
Hours after Wednesday's attack, the Pakistani Taliban in a statement claimed responsibility, saying it was a suicide attack.
The militant group Tehreek-e-Taliban Pakistan claimed responsibility for the attack. At least 11 persons injured in the blast are still under treatment at the Civil Hospital Quetta.
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Sharing further details on the law and order situation in the country, he said that there were threats for such an attack in Quetta, Peshawar, Karachi, Islamabad and Rawalpindi.
Officials said that Chinese ambassador and other Chinese officials were staying at the hotel but were not present in the hotel when the blast took place in the parking lot.
Southwestern Baluchistan province is the scene of a long-running insurgency by secessionist groups like the Baluchistan Liberation Front and the Baluchistan Liberation Army.
Pakistan's Interior Minister Sheikh Rashid Ahmed quickly blamed neighbouring India for the hotel bombing, although he provided no evidence to back up the allegation.
Balochistan's provincial Home Minister Ziaullah Lango told reporters that Mr Nong was "in high spirits" and that his visit to Quetta would conclude on Thursday.
Chinese Ambassador Nong Rong had earlier in the day met provincial Chief Minister Jam Kamal in the city.