Fort Hood shootings

FORT HOOD, Texas, Nov. 10 (UPI) -- Investigators are looking again at a series of messages the alleged Fort Hood, Texas, shooter sent to a radical Muslim cleric.

U.S. Army Maj. Nidal Malik Hasan is suspected of firing more than 100 rounds from a pair of handguns, killing 13 people and wounding about 30 others last week. Hasan was shot by civilian police and is under guard at a military hospital in San Antonio.

The FBI said Monday that messages Hasan traded with a cleric with whom he once worshipped in Virginia didn't indicate an "imminent attack."

The FBI released a statement that there isn't evidence to suggest Hasan "had any co-conspirators or was part of a broader terrorist plot." The New York Times said federal authorities are likely to file charges to have Hasan tried in a military court.

U.S. President Barack Obama heads to Texas to speak at a memorial service at Fort Hood. Participants in Tuesday's service are expected to include relatives of the 12 service members and one civilian killed in the attack.