A gun and grenade attack in the centre of the Belgian city of Liege has killed at least one person and wounded 47 including a toddler.

Witnesses say a man in his 40s threw grenades into a crowded square from a rooftop before killing himself.

Earlier reports said at least two more men were involved, but city officials said the attacker acted alone.

It is not clear who the attacker was, but the public prosecutor said terrorism was not a cause.

TV images showed blood splattered across the cobblestones of Place Saint Lambert, where the attack happened.

Doctors at a city hospital are trying to save the life of an 18-month-old boy injured in the attack. At least six others are reported to be in a serious condition.

Place Saint Lambert is a busy intersection, served by hundreds of buses daily. It hosts an annual Christmas market which attracts some 1.5 million visitors a year, BBC reported.