Police are probing an illegal party that took place at Joinville-Le-Pont near Paris, at which up to 400 people met up despite French COVID-19 lockdown rules banning large private gatherings. The Paris police department said on Saturday it had launched an investigation to find out who was behind the party, held in a large private house. Police added they had found that at least one of those at the party had tested positive for COVID-19, and urged others who were present to get COVID tests.