A two-member FBI team is in Pakistan to investigate several recent terrorist attacks in Islamabad and nearby garrison city of Rawalpindi, including strikes in which U.S. nationals were killed or injured.

The FBI team visited a police station in Rawalpindi on Thursday and collected samples from a cache of arms and explosives seized in a raid on a terrorist hideout in January.

Tight security measures were put in place when the FBI agents went to Saddar Bairooni police station and nobody was allowed inside during their 90-minute visit. A Pakistani employee of the U.S. embassy accompanied the two agents.

Additional Inspector General of Police Muhammad Aslam Khan Tareen said the FBI agents examined explosives seized by local police.

“They just wanted to examine it and compare it with (explosive) material they already had,” he said.

The explosives examined by the FBI team were recovered during a raid on a terrorist hideout in Dhoke Lakhan area on January 29. Police had then seized explosives, detonators, potassium chlorate, grenades and two motorcycles and arrested nine suspected terrorists. Another suspect had managed to escape.

All the suspects were belonged to Wana, the main town in the lawless South Waziristan tribal region.

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