Friday morning (Photo by Jen Carlson/Gothamist)

Sometime between yesterday morning and last night, Banksy's Twin Towers piece in Brooklyn Heights was buffed, which may have been the work of the city (according to a certain tabloid, they've been "hunting" the elusive street artist). The piece didn't last a week, but during its time up in the Fruit Street Sitting Area it was never defaced, and the yellow flower that was stuck in it was never removed.

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Thursday morning (Photo by Jen Carlson/Gothamist)

Meanwhile, the Twin Towers piece in TriBeca has been subject to more attention. Since Tuesday it's become something of shrine, with flowers placed next to it, as well as a letter asking haters not to touch it. Eventually some plexiglass was placed over it in an effort to preserve it, but last night someone covered it all with black paint:

This is why we can't have nice things, etc...