"Looks like yet another terrorist attack. Airplane departed from Paris. When will we get tough, smart and vigilant? Great hate and sickness!" Trump tweeted.
Soon thereafter the Egyptian Civil Aviation Minister Sherif Fethy told reporters in Cairo that this was more likely an act of terror rather than a result of technical failure.
Appearing on MSNBC's Morning Joe, former US Defense Secretary Robert Gates said that this does not look like a responsible statement.
"And with the demands with news media and so on, there is always pressure to immediately react before you know really what's going on. And that's a discipline a lot of politicians frankly do not have. At least until they have responsibility," Gates said.
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Gates said Trump's tweet "prejudges" the outcome of the investigation.
Meanwhile, US President Barack Obama has been briefed
about the crash.
"Assistant to the President for Homeland Security and Counterterrorism Lisa Monaco has briefed the President on EgyptAir Flight MS 804," a White House official said.