A bomb rocked a car park outside a police station in downtown Moscow on Tuesday morning, injuring one police officer.
The improvised device exploded when an officer at the station on Pyatnitskaya Street discovered it in a plastic bag, Moscow's chief police spokesman told RIA Novosti.
The officer was hospitalized with face injuries.
No theory for the attack was given.
"Investigators found pieces of metal cans, wires and a mobile phone at the scene of the blast," a police source said earlier on Tuesday.
The sources said the bomb was equivalent to 50 grams of TNT.
Militant groups in Russia's volatile North Caucasus region have been blamed for a number of attacks on Moscow in recent years. The Russian authorities have been fighting insurgents in the region for over a decade.
A suicide bomber attacked the arrivals hall in Moscow's Domodedovo airport in January, killing 37 people and injuring almost 200.
MOSCOW, May 3 (RIA Novosti)
Add to blog
You may place this material on your blog by copying the link.
Image Galleries: Yury Gagarin: Life of the First Man in Space in Pictures
Infographics: Sledge Hockey
For Russia, Crimea is more than just a territory. It is not for land that Russia is putting all her prestige at stake. This situation is about wounded national pride, history, identity, national phobias, a new Russian nationalism, past relations with the “West” full of real and perceived injuries, and Western hypocrisy.