US President Donald Trump has avoided revealing his personal appreciation for the cause of the massive explosion at Beirut Port.

The explosion - which occurred at the Beirut port on Tuesday - resulted in 137 deaths and about 5,000 injured, in addition to tens of missing persons and the displacement of about 250 thousand.

Trump said yesterday, Wednesday, "Nobody can say now whether the devastating explosion in Beirut was the result of an attack or an accident."

He pointed out that what happened in Beirut is still unclear, despite the fact that the Lebanese authorities said on Wednesday that the explosion in the capital resulted from storing 2750 tons of ammonium nitrate in a warehouse in the Beirut port "without any preventive measures."

On Tuesday, Trump said US generals - whom he did not name - had told him that the Beirut explosion was caused by a "bomb of some kind," adding "it appears to be a terrible attack."

On Wednesday, however, the US President considered that the question of the cause of the explosion remains unanswered, and he pledged support for Lebanon.

"I can tell you that what happened - whatever it is - is terrible, but they don't really know what it is, no one knows yet," he said.

"I heard both things, I heard it was an accident, and I heard it was explosive," Trump said.

Earlier Wednesday, - in contradiction to what Trump said - US Defense Secretary Mark Esper ruled out the Beirut bombing as a result of a bomb.

And White House chief of staff Mark Meadows went on to say that the US government does not completely exclude that the explosion was the result of a deliberate act.

"I am still receiving information about what happened" in Beirut, Esber said, adding that the majority of people thought it was an accident.

"We hope it is just a tragic accident and not a terrorist act, but we still look at all the information In this regard. "