Firefighters worked “extremely hard” to tackle the blaze as it tore through the Robertson building on Saturday. The Art Deco Willison House in Barrack St was built in the 1930s to a design by H Pierce Robbie and is on the Buildings at Risk Register for Scotland. Crews remained at the scene on Sunday morning after the fire sent a large plume of smoke over the town centre, which was visible from the opposite bank of the Tay. STV NewsFire at the former Roberston furniture store in Dundee STV News Several neighboring roads remain closed and are expected to remain closed for some time. Two fire engines were still at the scene on Sunday, with nine attending the incident on Saturday night. The fire is being treated as deliberate and Police Scotland said officers are following a number of lines of inquiry to identify those responsible. Detective Sergeant Stuart Martin, from Dundee CID, said: “This was a reckless and dangerous act of arson which has caused significant damage and disruption to the area. “We have spoken to a number of witnesses and would appeal to anyone with information about the incident to come forward and assist our enquiries.” Ashley Keithdundee fires up Ashley Keith Videos showed the fire engulfing the ruined building as dozens gathered in crowds to watch. Shona Robison, the SNP MSP for Dundee East and social justice secretary, tweeted: “Such a shame to see the destruction of the once magnificent Art Deco Robertson furniture store building in Dundee. “I think the emergency services are working hard to get the fire under control.” Conservative North East MSP Maurice Golden said he hoped “everyone is safe”. No casualties have been reported, Fire and Rescue Scotland confirmed. A spokesman said: “Operations Control mobilized nine appliances and specialist resources to the scene where firefighters worked through the night to extinguish the fire. “No casualties were reported. “Two appliances and specialist resources remain on scene while crews work to make the area safe.” Anyone with information is asked to call police on 101, quoting incident 2800 of November 12. Alternatively, you can call Crimestoppers on 0800 555 111 if you wish to remain anonymous.