Two men were arrested on Tuesday for allegedly killing five policemen in a terrorist attack on a security checkpoint in Giza governorate in mid-July, Al-Ahram Arabic website reported.
A security source told Al-Ahram that the two suspects were taken into custody along with the motorcycle used in the attack.
The police are still looking for a third suspect.
The source noted that the investigations thus far indicate that the suspects are members of an armed militant group affialiate with the Hasm and Agnad Masr groups.
During the arrest, the stolen weapons of the deceased policemen were seized by the police, said the source.
Early in the morning of 14 July, unidentified gunmen attacked the checkpoint in the town of El-Badrasheen in Giza, killing two low-ranking policemen and three conscripts, stealing their weapons.
Two days after the attack, security forces killed two men believed to be involved, a security directorate source told Al-Ahram Arabic news website.
Egypt is battling Islamist terrorist groups that are mainly concentrated in the restive northern part of Egypt's Sinai Peninsula.
However, militants have also struck elsewhere in the country, including the capital, often targeting police and army personnel.