The terror threat level in Northern Ireland has increased from "substantial" to "severe" meaning an attack is highly likely, the government has said. 'Nothing off table' as two RAF bases selected to house asylum seekers; Raab and Rayner take centre stage at PMQs Low - an attack is highly unlikely• Moderate - an attack is possible, but not likely• Substantial - an attack is likely - this is the UK's national threat level• Severe - an attack is highly likely• Critical - an attack is highly likely in the near futureAddressing the increased terror threat, Chief Constable Simon Byrne said it is part of an "ongoing process of monitoring the threat level in Northern Ireland, which is conducted by MI5". "With police officers facing such a threat, now is the time for the government to provide that additional funding to ensure the PSNI has the full capacity to meet this threat