Election officials said several helicopters have been pressed into service to supervise election management and an air ambulance has also kept standby to ferry any security and civil official in exigencies. A senior police officer said closed-circuit television cameras have been installed at entry points of Tripura's inter-state borders with Assam and other strategic locations. Tripura shares a 109-km-long border with Mizoram and 53-km-long border with Assam.