A Russian teenager has detonated an explosive device at an Orthodox school near a convent outside Moscow, injuring a number of people.

Russia's interior ministry says an 18-year-old man, a graduate of the school in Serpukhov, tried to blow himself up. He has reportedly survived.

The ministry says a 15-year-old is among the injured. Local media say as many as eight people are hurt.

Russia has seen a rise in attacks on schools by teenagers in recent years.

Local media reported that the man who set off the explosives was in a critical condition in hospital. He has been named as Vladislav Struzhenkov, BBC correspondents report.

Russia's Interfax news agency cited a source as saying the teen's animosity towards teachers and students at the school may have motivated the attack.

Another source told Tass news agency the former high school student was planning an attack during morning prayers, but his explosive device went off at the entrance to the monastery.

Prosecutors in the Moscow region have opened an attempted murder investigation - but the motive for the attack is yet to be officially confirmed.

The prosecutors posted a video from the scene showing police and ambulances outside the convent.

The governor of the Moscow region, Andrei Vorobyev, did not specify how many students were injured but said none were in a life-threatening condition.

In a Telegram post, he said "all services reacted on time" and "doctors helped injured children".

The Vvedensky Vladychniy Monastery in Serpukhov was founded in 1360. Children between seven and 16 are taught at the school, about 100km (60 miles) south of Moscow.

(BBC)