Heightened terror alert across Europe

As terror alert was heightened across Europe Saturday, Belgium mobilized 300 armed troops to guard streets in its cities, including special units outside Jewish schools and government buildings in Brussels and Antwerp.
British police have been put on the highest level of alert against plots like those uncovered in Belgium to murder officers.

Friday, an 18-year old British girl of Kurdish origin, Silhan Ozcelik, was arrested at Stansted Airport outside London on her return from a four-month stay in Syria. British security authorities suspect her of links with terrorist organizations, but her family who lives in North London say she was a humanitarian aid worker.