Security has been tightened in the Egyptian capital, Cairo, and in other cities ahead of possible anti-government protests.

Tahrir Square, where protesters gathered in January 2011, has been closed and three neighbouring metro stations have been shut down.

The protests have been called for by an exiled opponent of the government.

President Abdul Fattah al-Sisi has arrived back in Egypt after attending the UN General Assembly in New York.

He told supporters at Cairo airport there was no need for concern.

Rare protests took place a week ago, leading to the arrest of nearly 2,000 people.

Pro-government protests are also due to take place at Rab’a Square where nearly a thousand pro-Muslim Brotherhood protesters were killed in 2013.