MARINE STRAUSS BELGIUM'S crisis centre said that an attack on the Brussels metro was unlikely after EU institutions and international embassies warned their employees of bomb threats in central Brussels. Federal body OCAM, which analyses risks to the country, added in a statement that police had carried out a security sweep of the metro as a precaution. While the Brussels prosecutor opened an investigation, the general threat level for Belgium remained at 2 on a scale of 4. Belgian daily Le Soir said the European Commission informed the police on Tuesday afternoon of an email written in Russian and referring…