The UK terror threat level has been raised from severe to critical, the highest level, following the Manchester Arena bombing.
The move indicates another attack could be 'imminent' and 'highly likely'.
Teresa May announced the change yesterday following an emergency COBRA meeting. Under Operation Temperer, members of the armed forces could be deployed to public events such as concerts and sports events, also on the streets and at major shopping centres.
This is the first time in a decade that the terror threat level has been at critical. The last time was in 2007 following the Glasgow airport attack.
Hampshire Police's Assistant Chief Constable Amanda Pearson said:
"As part of the national plans in relation to the move to Critical, the public should not be surprised to see additional police officers - including armed officers - in busy locations in Hampshire such as train stations and shopping centres.”
Threat levels are designed to give a broad indication of the likelihood of a terrorist attack.
:: LOW means an attack is unlikely
:: MODERATE means an attack is possible, but not likely
:: SUBSTANTIAL means an attack is a strong possibility
:: SEVERE means an attack is highly likely
:: CRITICAL means an attack is expected imminently