Jerusalem (CNN) -- Israeli Defense Minister Ehud Barak has ordered the army to seal off the West Bank for 48 hours and tightened security around the old city of Jerusalem, Israeli officials said Friday.

One Palestinian was injured in the old city after Israeli police restricted worshipers from entering the Al Aqsa mosque for Friday prayers.

The closing of the West Bank follows Israel's controversial announcement this week that it plans to build 1,600 new apartments on land in Jerusalem claimed by both Israel and the Palestinians.

The restriction began at midnight Thursday and will be lifted at midnight Saturday, "in accordance with security assessments," the Israel Defense Forces said.

Medical workers and patients, religious workers, teachers, humanitarian workers, and journalists will still be permitted to enter and leave the West Bank, the IDF said. It also promised that trade would still operate as normal.

Security in and around the old city in Jerusalem was also tight Friday. Police spokesman Micky Rosenfeld said there was extensive deployment of police in largely Arab East Jerusalem in order to prevent the development of riots.

Worshipers younger than 50 and women of any age were not being allowed to attend Friday prayers at the Al Aqsa mosque, one of the city's holiest sites, Rosenfeld said.

Police were stationed at a number of points around the compound known to Jews as the Temple Mount and to Muslims as Haram-al-Sharif, police said.

People prayed in the streets around entrances to the old city after police prevented them from entering the mosque.

Palestinian medics evacuated one injured man and said he had been hit in the head with an Israeli police baton.

Last week, dozens were hurt during clashes around the mosque, and police used tear gas and rubber bullets against protesters. That violence was sparked by Palestinian opposition to Israel's decision to place two religious shrines in the West Bank on a list of Zionist heritage.

CNN's Kevin Flower and Guy Azriel contributed to this report.