premise: At 5:30 p.m. on Thursday, 10-15 UFOs were spotted over north London in the inner-city district of Islington. The Islington police said they started receiving phone calls only minutes after the objects started appearing. 34 year-old market stall trader Alix McAlister, who witnessed the objects, said that, "I just picked up my son from nursery in Bredgar Road. I had just come out of the door when I noticed what was going on in the sky. There were a group of them - 10 to 15 of them moving together. My first impression was that they reminded me of a squadron of aeroplanes in formation. But they didn't have a proper formation and they were all moving at the same speed. I thought for a while that something was happening in the centre of London.
hypothesis: Alix McAlister has a market stall in Bredgar Road.