A crowd of at least 10,000 men, women, and children gathered in an open space which was nearly completely enclosed by walls and had only one exit. The British had just passed a law on no public gatherings. Dyer and his soldiers arrived and sealed off the exit. Without warning, the troops opened fire on the crowd, reportedly shooting hundreds of rounds until they ran out of ammunition. According to an official report, an estimated 379 people were killed, and about 1,200 more were wounded.