Members of the public are being asked to keep a look out and report any suspicious activity in order to help prevent terrorist attacks.
The main road from Wrentham to Southwold in Suffolk is impassable due to a jackknifed lorry trailer at South Cove.
A weather warning for severe cold and heavy snow that could lead to travel disruptions has been put in place for the region next week.
max temp: 12°C
min temp: 6°C