The terrorists used jammers to attack the weapons of the guards.
The Afghan spy agency said the explosive used by Taliban militants was Pakistan's attack on the Intercontinental Hotel in Kabul last weekend. The explosive came from Pakistan.
The National Security Service (NDS) said it discovered the attacker's vehicle entering the hotel grounds on Saturday. Before security forces ended the siege on Sunday, the attackers killed 22 people, including 14 foreigners.
NDS said in a statement, “The explosive material seized from the car indicates that the material was made in Pakistan. "
The statement also indicated that the explosives used by the attackers were produced by Biafu Industries Ltd., a private company based in Islamabad.
An Afghan security official who asked not to be named told the Afghan news agency Pajhwok on Wednesday that three militants drove to the hotel in a van full of Pakistani-made explosives, but that they had not exploded.
The official said a team of detectives seized the truck and used a wifi jammer to destroy remote control equipment belonging to the attacker.
According to Biafo's website, the company is a modern explosives manufacturing company. It claims to be a highly automated device capable of producing over 2,500 metric tons of explosives per shift per year.
Biafo also said it produced Tovex hydrogel explosives at its factory in Hatata Industrial Zone, Khyber Pakhtunkhwa province.
The US State Department said Tuesday that many US citizens were killed in the 1-hour siege of the InterContinental Hotel, including 22.
There is no exact number of fatalities or injuries in the United States. Afghan officials said 14 foreigners were among the dead. Eleven of the foreigners have already been identified as employees of the private Afghan airline KamAir.
The InterContinental Hotel was under siege when Afghan security forces killed the last of six Taliban fighters with a suicide vest. The latter broke into the building, looking for foreigners and Afghan officials to kill.
More than 150 people, including 41 foreigners, were rescued or managed to escape. As the assailants walked the halls of the hotel, some people hid under bathtubs or mattresses and killed people.
The Afghan Interior Ministry said it is investigating how the attacker used the wave jammer to easily enter the building.