55 people remain hospitalized from the marathon attack . Authorities have not said publicly what charges will be filed against Dzhokhar Tsarnaev , but a Justice Department official , who has been briefed on the case , told CNN he will face federal terrorism charges and possibly state murder charges . Doctors are ` ` cautiously optimistic '' a wounded police officer will recover . The surviving officer was shot in the back of the neck , a witness tells CNN . Based on evidence , the brothers were going to kill others , an official says .
55 people remain hospitalized from the marathon attack . Doctors are ` ` cautiously optimistic '' a wounded police officer will recover . The surviving officer was shot in the back of the neck , a witness tells CNN . Based on evidence , the brothers were going to kill others , an official says .