Five officers were injured in the riot that began at around 3:00 a.m. (0100 GMT) when police tried to stop a brawl involving around 30 people in Frankfurt’s historic Opera square. The square has become a popular gathering place for what local media have dubbed “corona parties” as Germany’s bars and clubs remain closed to contain the spread of the virus. Some 3,000 mainly young people filled the square again on Saturday evening but only around 500 to 800 were still there when the unrest started. A small group of officers moved in to help a bleeding man and end the brawl, but the crowd turned on them. Thirty-nine people were detained after police were attacked with “a hail of bottles” at an open-air party in central Frankfurt attended by thousands of youngsters. AFP Back-up police then arrived and cleared the square, while facing “a hail of bottles” from the angry crowd. A total of 39 arrests were made, including one woman. (AFP) FRANKFURT AM MAIN – Thirty-nine people were detained after police were attacked with “a hail of bottles” at an open-air party in central Frankfurt attended by thousands of revelers, police in the German city said Sunday.