The construction company Metrostav has broadened for the second time a complaint against Prague City Hall over Blanka Tunnel and an alleged unpaid 3.7 billion crowns for the project which includes a new bridge in the Prague-Troja area. Prague City Hall said it had the funds to pay off bills due but no legal framework for payment after it came to light contracts between Metrostav and the city might be invalid. The matter ended up in arbitration court. Blanka Tunnel is expected to cost Prague some 36 billion crowns. It was originally meant to be opened in May; now a date in September is being discussed, after a preliminary decision ordered Metrostav to continue work on the tunnel complex.