Security forces arrested yesterday one of the attackers behind a drive-by shooting that killed two police captains and one enlisted member of the police service earlier this month. Investigators have also identified three other alleged perpetrators, the Interior Ministry announced yesterday. According to the statement, the men are members of the Hasm militant group (an offshoot of the Muslim Brotherhood) and are implicated in a number of other terrorist attacks. The ministry’s announcement came hours after Hasm released what appears to be video footage of the attack. (We have viewed the video and believe it has hallmarks that suggest it could be genuine. That said, we are not linking to it this morning, and the website to which it has been posted appears to have since been blocked by the authorities.)

The group had threatened earlier in the day to launch an attack in a “hail of bullets” at 7pm last night without providing further details, leading the US Embassy and some workplaces in Cairo to issue security warnings.