A Bahraini teenager was killed on Wednesday in clashes with police at a Shiite village near the capital Manama, the main Shiite opposition bloc Al-Wefaq said.
"Mahmud Mohsen succumbed to his wounds after being hit by buckshot on Wednesday in Sitra," Al-Wefaq said on Twitter.
The 15-year-old was hit when security forces "opened fire on demonstrators," Al-Wefaq added, saying he had been hit in the chest and heart.
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The interior ministry said police had been notified that a dead person was admitted to a clinic in Sitra, and that an investigation was underway.
Witnesses said the clashes broke out in the afternoon during a ceremony to mark the death of a Shiite killed in an explosion last Friday.
Bahrain remains deeply divided three years after security forces crushed an Arab Spring-inspired uprising, with persistent protests sparking clashes with police, scores of Shiites jailed on "terror" charges and reconciliation talks deadlocked.
Attacks on the security forces have intensified in the Sunni Muslim-ruled kingdom, mainly in Shiite-populated villages surrounding the capital.