A team of FBI investigators is due to arrive in Lebanon this weekend to take part in the probe of Beirut's massive explosion, a senior US official said on Saturday after visiting the location of the blast.
David Hale, US undersecretary of state for political affairs, called for a thorough and transparent investigation.
He said the FBI team is taking part at the invitation of Lebanese authorities in order to find answers about what caused the August 4 explosion which killed nearly 180 people and wounded thousands.
The cause of the fire that ignited nearly 3,000 tons of ammonium nitrate