Arsonists attack Sinn Fein premises
Sinn Fein's headquarters in Derry has been targeted by arsonists.
Police said a rear window was broken and flammable liquid poured in shortly before midnight on Sunday.
The incident happened at the constituency office on Eastway Road in the Creggan area.
Firefighters brought the blaze under control quickly and damage was confined to one part of the building.
Northern Ireland Secretary Theresa Villiers said: "I totally condemn this disgraceful attack. The criminals responsible show nothing but contempt for democracy and the political process."
MLA Raymond McCartney said it would not deter the party from representing people in the area.
"This must be condemned as an attempt to attack the democratic process.
"It will not stop us working for the people of Derry.
"It will be business as usual for Derry Sinn Fein, continuing to serve the people of the city and the wider north west."
The office, at Rathmore business park, was the target of a similar arson attack in 2009.