A gun and grenade attack in the centre of the Belgian city of Liege has killed at least two people and wounded about 25 including a toddler, media say. Witnesses say a man in his 40s threw grenades at a bus stop in Place Saint Lambert, a busy square. At least one other man is thought to be involved. Reports say one of the attackers is among the dead. Local media said one man had been seized by police, while another took refuge in the nearby Palace of Justice. Medical staff are said to be attending to the injured in the courthouse. Doctors at a city hospital are trying to save the life of an 18-month-old boy injured in the attack. Roads into the centre of the city have been sealed off. Explosives experts are on their way to the square. There is no word on who carried out the attack.