Markets in the national capital are closed for 48 hours starting today as trade unions intensify their protest against the municipal corporations for sealing their shops. The traders said they will extend the bandh for a third day if the BJP-ruled civic agencies do not stop the sealing drive. The Confederation of All India Traders said thousands of shops, big and small, will be closed during the bandh. "Protest marches against sealing would be taken out by businessmen in around 500 markets. The ongoing sealing is very harmful to our economy," Praveen Khandelwal of the traders' union said.