A painting by Mark Rothko has been defaced at the Tate Modern art gallery.
Police were called after a small area of the mural piece was painted, a spokeswoman for the gallery said.
Tate can confirm that at 3.25pm this afternoon, there was an incident at Tate Modern in which a visitor defaced one of Rothko's Seagram murals by applying a small area of black paint with a brush to the painting. The police are currently investigating the incident.
The gallery was shut for a short period and then reopened.
More top news
Scientists have unveiled high-tech plans to preserve ancient sites in the Middle East at risk of destruction by the so-called Islamic State.
More is needed to help overcome poverty and inequality in New Orleans, 10 years after Hurricane Katrina devastated the area, Obama has said.
WARNING: Some people may find images upsetting.