Belgian police arrested a man accused of Mayor's murder. (Reuters file photo)

Belgian police arrested a suspect after a local mayor had his throat slashed in a graveyard, authorities said Tuesday as they probed a murder that shocked the country.Alfred Gadenne, 71, was found dead on Monday in a cemetery where he opened and locked the gates every day, near his home in Mouscron, near the French border.Local media said the suspect is an 18-year-old who attacked the mayor to avenge his father, a former town employee who was sacked and committed suicide in 2015.The case sparked strong emotion on Tuesday in Belgium. Prime Minister Charles Michel on Twitter said he learned "with alarm" the death of Gadenne, who he said was widely liked by all.Mouscron, a town of about 60,000 people, is known for its pubs and nightlife that attracts revellers from nearby France.

Martine Aubry, the former French Socialist party leader and long-time mayor of neighbouring Lille in a tweet said she was "horrified" by his death.