Egypt's security forces are on high alert today ahead of pro-democracy protests to mark the second anniversary of former president Hosni Mubarak's fall from power.

Authorities have boosted security around the presidential palace, the interior ministry and around Tahrir Square, as well as around key public installations.

Marches are due to set off at 3 o'clock today from several locations in the capital towards Tahrir -- the epicentre of protests that toppled Mubarak-- and the presidential palace where violent, sometimes deadly, protests have been staged against Islamist President Mohamed Morsi.

Opposition parties and movements have called for a day of action, demanding Morsi fulfill the goals of the revolution that brought him and his long-banned movement, the Muslim Brotherhood, to power.

Two years ago, Egyptians poured into the streets to celebrate Mubarak's fall.

The 84-year-old's spectacular fall from grace in a popular revolt sent shock waves across the Middle East and beyond when he announced his resignation on February 11, 2011 after an 18-day popular revolt.

But two years later, many are angry that the main goals of the revolt -- freedom and social justice -- have not been achieved and that the country is more polarised between Morsi's mainly Islamist supporters and a wide-ranging opposition.

You can watch a video on Mubarack's fall from power below: