President Donald Trump suggested on Tuesday that a bomb attack was behind the catastrophic explosion that rocked Beirut earlier in the day, seemingly contradicting Lebanese officials’ explanations that it was caused by confiscated explosives.

The exact cause of the explosion was unclear Tuesday afternoon, but Abbas Ibrahim, chief of Lebanese General Security, said it was set off by explosive material that had been seized from a ship years ago, The Associated Press reported. The Lebanese interior minister also backed that explanation, saying the material was ammonium nitrate held in the port since 2014, Reuters reported.

Read the rest of the story at Politico