PARIS -- An 11-year-old British girl was shot dead in Saint-Herbot, a hamlet in Brittany, western France, on Saturday, according to the local prosecutor.

The girl鈥檚 parents were seriously wounded in the gun attack. Her 8-year-old-sister escaped and was found 鈥渦nharmed but in a state of shock,鈥 Quimper prosecutor Carine Halley said in a statement on Sunday.

The family were in their garden when their 71-year-old Dutch neighbour appeared with a firearm and started firing several times in their direction before shutting himself in his house with his wife, authorities say.

Police intervened at 10 p.m. local time. The 11-year-old was found dead and her father sustained a life-threatening head injury, while her mother was also injured but is not in critical condition, Halley said.

An hour later the Dutch man and his wife surrendered and were taken into custody.

鈥淲e thought they were playing with firecrackers,鈥 Yannick, a neighbour who heard the gunfire, told CNN affiliate BFMTV.

鈥淭he youngest girl came running to the neighbours shouting: 鈥楳y sister is dead, my sister is dead,鈥欌 Yannick said.

Halley said Sunday 鈥渢he motives for the tragedy are not yet known.鈥 But, according to the initial investigation, 鈥渋t appears there had been a dispute between the two neighbours for several years over a piece of land adjoining the two properties.鈥

The Quimper prosecutor鈥檚 office has opened an investigation on charges of voluntary manslaughter of a minor and attempted murder.

Marguerite Bleuzen, the mayor of Plonévez-du-Faou, a town bordering Saint-Herbot, told BFMTV Sunday she had been made aware of a dispute between neighbours several years ago.

鈥淚 intervened with my deputies when we were elected. There was a problem with the land, noise complaints,鈥 Bleuzen said.

鈥淚鈥檓 dumbfounded,鈥 the mayor added.