Building company Metrostav has increased its Blanka tunnel court claims against Prague City Council by around 500 million crowns to 2.7 billion crowns, the company said on Thursday. The additional sum represents claims for unpaid work in November and part of December, the company said. Metrostav halted work on the Prague road tunned in December because the city council had not paid bills and the two sides failed to agree on how work should go forward. In separate news, justice minister Helena Válková has demanded Supreme State Attorney Pavel Zeman keep an eye on the Blanka tunnel case. The tunnel was originally supposed to open in 2011.