The spokesman for Egypt's Interior Ministry says a bomb went off next to a police institute in eastern Cairo, but caused no casualties.
The blast came the morning after a series of bombings targeted police across Cairo, leaving six dead and sparking fears of an intensification of violence following the ouster of Islamist President Mohammed Morsi in a military coup on July 3.
Gen. Hani Abdel-Latif told The Associated Press that the blast took place at 7 a.m. on Saturday in the busy district of Ein Shams, but damaged only the institute's walls.
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The bombing came as Egypt marks the 3rd anniversary of the 2011 uprising that toppled longtime autocratic president Hosni Mubarak. Morsi supporters as well as military loyalists plan rival rallies.