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It sounds like Saturday evening was an eventful one in Greenwich. Apparently a group of residents called the police after they spotted what they thought was a UFO in the sky:

The bright, moving lights in the sky caused several people to call police to report a possible UFO sighting. Some reports indicated there had been 30 to 40 individual lights glowing in the night sky. The questions prompted police to send two marine officers to investigate the sighting.

Needless to say, extra-terrestrials did not decide to make Greenwich their latest stopping off point. So what was it? If you guessed it was 30-40 "genuine oriental sky lanterns" resembling "mini hot-air balloons" set aloft in the sky as part of a fancy birthday party, pat yourself on the back. [Greenwich Time]