Egypt's President Abdul Fattah al-Sisi says that rumours aimed at fuelling discontent are among the most serious dangers that his country faces.

Addressing students from military academies, Mr Sisi said there were elements seeking to manipulate people.

He said they wanted to sow confusion and frustration, and warned that such things could destroy nations.

He claimed that more than 20,000 rumours had been spread in recent months.

Mr Sisi's critics accuse him of presiding over the most serious crackdown on dissent in years. Many who oppose his policies have been jailed.