The comments came during a joint news conference with President Abdel Fattah al-Sisi of Egypt following al-Sisi’s visit to Downing Street on Thursday.
David Cameron backed out of answering the question directly, explaining that his role “is to act in the right way to keep British citizens safe and secure, and to put their security first.”
He said that his decision was based on intelligence reports and advice that he had received.
“Of course I cannot be sure, my experts cannot be sure that it was a terrorist bomb that brought down that Russian plane. But if the intelligence and the judgement are that that is a more likely than not outcome, then I think it’s right to act in the way that I did.”
Neither did the British prime minister name any concrete reason for suspending flights from the UK to Egypt in a phone call with President Vladimir Putin on Thursday, according to Kremlin spokesman Dmitry Peskov.
President Putin stressed that it was vital to rely solely on information provided by the official investigation.
Earlier in the day, the Kremlin's spokesman said that Russia hopes the United Kingdom will provide data to back recent statements that the Russian airliner crash in Egypt was likely caused by a terrorist attack.