. >>> it could take up to a week to learn exactly what caused the evacuation of the head caquarte. a letter was sent with white matter. it was harmless. >>> today former governor martin o'malley will be in virginia. the presidential candidate is visiting the mochlkt he's speak out. adams is the biggest mosque in our area and the second biggest in the country. >> incredible. a factory just blown up in syria. two rebel groups are blaming responsibility. it demolished the factory you see there. take a look at the orange dust in the air. the groups say the site was used to make chemical weapons for the syrian government. >>> a heightened alert in switzerland. police are hunting for four people they say are linked to isis. police believe the suspects were planning an attack. they're warning u.s. citizens to have a personal security plan and be extra vigilant. >>> 4:48. a former police officer could be sentenced to more than 260 years behind bars. they found daniel guilty of 260. they convicted him of both rape and battery. >>> for the first time we'll hear from the family of a chicago t