Rescue workers at the scene of Beirut explosion

A senior U.S. official, David Hale on Saturday called for a “thorough, transparent and credible” investigation into this month’s Beirut port blast that killed 172 people and injured over 6,000.

“We can never go back to an era in which anything goes at the port or the borders of Lebanon that had to contribute to this situation,” U.S. Under-Secretary of State for Political Affairs, said.

The Aug. 4 blast, which the authorities said was caused by more than 2,000 tonnes of ammonium nitrate that had been unsafely stored at the port since 2013, damaged swathes of the city and left 300,000 homeless.

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Some 30 people remain missing.

“Every sovereign state controls its ports and its borders thoroughly and I imagine all Lebanese would like to return to that era,” Hale said after visiting the port.

Meanwhile, he added that FBI agents would be arriving this weekend to help find out what exactly happened and “what led to the circumstances of this explosion”.