Coloured flashing lights moving quickly, stopping for two seconds and moving off in a completely different direction, extremely fast

Just happened to be looking out of my apartment window, when I saw what I believed at first to be a plane, flashing lights. It moved faster than any plane I had ever saw. It stopped suddenly and stood still for 2 maybe 3 seconds. It then set off at super speed about 90 degrees to the direction that I first saw it. Disappearing over the rooftop. Was also sure while still looking up, a few seconds later, another more distant object come from the south and follow in the same direction.