Bird is the word

Raptor perched on the weathervane atop Needham Town Hall today; while it was there, a flock of pigeons, escorted by a couple of crows and seagulls, kept flying around, no doubt outraged that its normal perches atop Town Hall had been usurped. Can anybody tell from the photo just what sort of bird that is?

Below the weathervane is a large clock that proves the old adage about every clock being right at least twice a day: