Helwan prosecutors ordered the detention for four days pending investigations of a low-ranking policeman Sunday on accusations of attempted murder after he shot at a young man, injuring him in the chest and arm.
The officer allegedly used his service weapon during a fight between his brother and their neighbour on Saturday.
Last February, another low-ranking policeman shot dead a taxi driver in a fight over the fare in Cairo's El-Darb El-Ahmar.
Local media outlets have quoted interior ministry officials as saying that policemen must turn in their weapons by the end of their work hours, though it is unclear if this applies to all law enforcement officials.
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