There are regular strikes. These are sometimes called at short notice and can cause disruption to public transport in and out of Greece (including air travel and ports). Demonstrations take place regularly in central Athens, and have also taken place in other towns and cities. You should avoid all demonstrations and follow the advice given by local security authorities. In the early hours of 10 April there was a large explosion outside the Bank of Greece in central Athens. There are no reported injuries. There is a general threat from terrorism and acts of political violence. The emergency services number in Greece is 112. Calling 999 from a UK mobile in Greece will automatically transfer you to the Greek emergency services. Around 2 million British nationals visit Greece every year. Most visits are trouble-free, but you should take sensible precautions to protect yourself and your belongings. Carry a copy of your passport or other photographic ID which confirms British nationality at all times. The Greek police will not accept rowdy or indecent behaviour, especially where excessive drinking is involved. Greek courts impose heavy fines or prison sentences on people who behave indecently. Your travel insurance may not cover you after drinking. The Overseas Business Risk service offers information and advice for British companies operating overseas on how to manage political, economic, and business security-related risks.