Dehradun (Uttarakhand), May 18 (ANI): State govt has tightened the police surveillance at all inter-state border check posts in Uttarakhand. The step has been taken as a precautionary measure against coronavirus. At Aasarodi inter-state border check post, police was seen checking the vehicles and thermal screening was also being done in the area. Increased movement of migrant workers from outlying states is also one of the reasons behind police surveillance. The nationwide lockdown has been extended till May 31. Total number of positive cases in Uttarakhand has mounted to 99.