Egyptian authorities reopened downtown Cairo's Sadat metro station after a one-day closure Wednesday over security concerns on the sixth anniversary of the 2011 popular revolution that toppled longtime president Hosni Mubarak.

"The station was reopened in the first and second [Metro] lines at the start of operating [hours] on Thursday," said Ahmed Abdel Hady, spokesman for the Egyptian Company for Metro Management and Operation.

The company had said the station was closed early Wednesday over "security concerns," state news agency MENA reported.

Sadat is one of two hubs where commuters can switch between the city's two main lines.

Located under the iconic Tahrir Square -- the epicenter of the 2011 uprising and a venue of many mass protests and clashes -- Sadat station has been repeatedly closed for security reasons since the 2013 ouster of Islamist president Mohamed Morsi.

The station's longest closure lasted nearly two years, beginning in August 2013 on the back of nationwide unrest following Morsi's removal.

Over 3.5 million of greater Cairo's 21 million inhabitants rely on the subway for their daily travel, according to official estimates by the country's national tunnels authority.