Police on horseback and using a water cannon charged a crowd of thousands of people gathered in a Brussels park on Friday for a fake concert announced on social media as an April Fool's Day prank. AFP journalists at the scene saw at least one police officer injured and several people in the crowd arrested in the Bois de Cambre park on the southern outskirts of the Belgian capital. The police moved in to enforce strict Covid-19 social-distancing rules that prohibit gatherings of more than four people outdoors. kf-rmb/arp/dl