Militant groups belonging to Egypt's Muslim Brotherhood (MB), from which the ousted president Mohamed Morsi hails, attacked the famous Alexandria Bibliotheca on Wednesday, State TV reported.
The Bibliotheca has sustained intensive shooting from MB militants, as they were attempting to siege it from all directions.
One policeman was severely injured after being shot in the chest, the report said.
Further forces from the army are on the way to protect this important library, according to the report.
Earlier in the day, the Egyptian presidency announced a state of emergency nationwide for one month, due to current turmoil over the dispersing of pro-Morsi protesters.
The presidency's statement said that imposing the state of emergency was due to ongoing dangers and deliberate sabotage acts by some extremist groups, implying supporters of Morsi.