Via The Telegraph:
Some questioned whether aliens were about to land, with one woman tweeting: “UFO invasion?! Ball of fire flew past my window!” Others called the Police. The most likely explanation, though, was an unusually bright shooting star, or meteor. Thousands of people spotted the chunk – or possibly chunks - of roughly fist-sized space rock burning up while coming through the earth’s atmosphere at an altitude of 60 or 70 miles or so at about 10pm.