UK Prime Minister Boris Johnson on Wednesday apologised "unreservedly" on behalf of the British government for the deaths of 10 innocent people killed in a 1971 incident in Belfast, Northern Ireland during a British Army operation.

A judge-led inquiry on Tuesday found that British soldiers unjustifiably shot or used disproportionate force in the deaths of nine of the 10 people killed in the incident, which sparked an upsurge of sectarian violence during the "Troubles" in Northern Ireland, a British province.

"The Prime Minister apologised unreservedly on...