Security video and a witness's cell phone video are being used to track down a man who spray-painted over a Picasso painting in Houston, according to an article from The Associated Press. 

Officials say that the vandalism happened Wednesday afternoon at the Menil Collection in a Houston art museum, where the 1929 painting, "Woman in a Red Armchair," is one of nine Picassos. Using a stencil, the vandal painted a bull on the face of the figure in the painting.

Menil spokesman Vance Muse told the Houston Chronicle that museum security officers detected the vandalism almost immediately, when the paint was barely dry. Chief conservator Brad Epley began repair work immediately, and Muse says the painting has "an excellent prognosis," according to the article. 

The vandal fled and has not been arrested, but the cell phone video posted on YouTube by the witness seems to identify the spray-painter as a man in a dark colored suit.