Norway on high terrorism alert

(ANSA) - Oslo, July 24 - Norway was on maximum alert Thursday after intelligence services warned of an "imminent terrorist attack" by extremists who have returned to Europe after fighting in the ongoing Syrian civil war. Norwegian intelligence said the threat was not "specified" but that it was "credible", and that an attack could come within "days". Consequently Oslo introduced "extraordinary security measures" particularly at sensitive sites such as stations and airports.