KARACHI, Pakistan -- Militants attacked the stock exchange in Karachi on Monday, killing at least three people -- two guards and a policeman, according to police. Special police forces deployed to the scene of the attack and in a swift operation secured the building, killing all four gunmen.
A third security guard was reported to be in critical condition following the assault.
There were no reports of any wounded among the brokers and employees inside the exchange, and a separatist militant group from a neighboring province later claimed responsibility for the attack.
The attackers were armed with grenades and automatic rifles, police said. They launched the attack by opening fire at the entrance gate of the Pakistan Stock Exchange in the southern port city, the country's financial center.
Heavily armed special forces quickly surrounded the building located in the heart of Karachi's financial district, where the Pakistan State Bank is located, as well as the headquarters of several national and international financial institutions.
Local television stations broadcast images of police in full body armor surrounding the building but still staying outside the high-walled compound of the stock exchange.
Rizwan Ahmend, a police official at the scene, said that after opening fire, the gunmen entered the stock exchange grounds. He said that after the attack was over, food supplies were found on the bodies of the gunmen, indicating they may have planned a long siege.
Inside the stock exchange, broker Yaqub Memon said that he and others were huddled inside their offices while the attack was underway. As the firing ended and the gunmen were killed, police gathered all the employees and brokers in a single room while security forces went floor by floor to ensure that no explosives had been left behind, he said.
Shazia Jehan, a police spokesman, said the bomb disposal team also was called to clear the building of any explosive devices.
Later, the Baluchistan Liberation Army, claimed responsibility for the attack. The group has been waging an insurgency for years, demanding independence for Pakistan's gas-rich southwestern Baluchistan province, which borders the southern Sindh province, where Karachi is the provincial capital.
The group also circulated to the media a photograph of four men in full body armor and camouflage outfits, saying they were the militants who attacked the stock exchange.
At a news conference later Monday, Maj. Gen Omar Ahmed Bokhari who oversees the paramilitary Rangers force, which took part in the operation, accused neighboring India of aiding the attackers, by allegedly activating "sleeper cells" that Pakistan claims Indian intelligence has planted throughout the country.
India and Pakistan routinely exchange allegations of using militant groups to attack the other country. The two nuclear-armed neighbors have fought three wars, two of them over the disputed Himalayan mountain region of Kashmir, which is divided between the two but coveted by both in its entirety.
The Baluchistan Liberation Army, which Pakistan says has found safe harbor across the border in Afghanistan, has carried out several attacks in Karachi in recent years, including an attack on the Chinese Consulate in November 2018 that killed two people.
Bokhari said Monday's attack bore the same hallmarks as the Chinese Consulate attack, with the level of coordination and a large ammunition stockpile found at the scene.
Information for this article was contributed by Kathy Gannon of The Associated Press.