(Adds U.N. Human Rights office concerned by anti-Roma rallies)
SOFIA, Oct 4 (Reuters) - Bulgarian prosecutors on Tuesday said they had charged the grandson of Roma clan leader Kiril Rashkov with making death threats during a confrontation with villagers that sparked days of anti-Roma rallies in the EU's poorest state.
The unrest, the worst in Bulgaria in 14 years, started after a man linked to Rashkov was accused of killing 19-year-old ethnic Bulgarian Angel Petrov last month in the village of Katunitsa, about 160 km (100 miles) east of Sofia. .
One of Petrov's relatives later filed a complaint, accusing Rashkov's grandson of shouting death threats at him minutes before Petrov was run down and killed by a minivan, said officials. Rashkov's grandson is also called Kiril.
"Charges have been raised against Kiril Rashkov for making murder threats on the night of the incident in Katunitsa," said the spokesman for the regional prosecutor office in Plovdiv.
Thousands of young people took to the streets, rallying against minority Roma gypsies, accusing them of involvement in organised crime and demanding justice for the death of the teenager.
The United Nations Human Rights Office on Tuesday said it was growing increasingly concerned about the protests which, it said, were fueled by hate speech.
"It is unacceptable for an entire community to be targeted for an offence allegedly committed by an individual," it said in a statement.
Rashkov faces up to six years in jail if convicted.
The grandfather, known as Tsar Kiro, has also been charged with making murder threats. He is awaiting trial in prison. (Reporting by Tsvetelia Tsolova; Editing by Shaimaa Fayed)
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