Lebanese president Michel Aoun called the investigation into the explosion in Beirut "very complex" and said that it will not be completed soon, the Associated Press reported.

Asked about the calls for resignation, Aoun said in an interview with BFMTV that this would not have been possible as there was a power vacuum.

The Lebanese president said that the investigation consists of three parts.

The first part of the investigation is aimed at finding an answer regarding the determination of the circumstances associated with the cargo, the second - to determine where it came from and who sent it, and the third - to determine who was responsible for handling and ensuring the safety of the cargo.

“We had the determination to reach conclusions quickly but we found out that the issues are very complex and require time,” the president said.

According to him, information about the explosive substance in the port reached him "very late", but his military adviser was assured that this issue is being dealt with by those directly responsible for it.

The Lebanese president added that the FBI and French investigators are helping because “they more than us have the capability and ability to find out the details of what got the ship here, what is the source and who owns it”.

Aoun added that he had requested satellite images to determine if the explosion was a consequence of an air attack and said he did not rule out the possibility of a foreign missile attack.