Washington, Nov. 10 : The military psychiatrist accused of shooting to death 13 people at Fort Hood, Texas, and a radical cleric in Yemen known for his incendiary anti-American teachings, were in communication with each other for some time before the crime.

Federal authorities, however, dropped an inquiry into the matter after deciding that the messages from the psychiatrist, Major Nidal Malik Hasan, did not suggest any threat of violence and concluding that no further action was warranted, government officials said Monday.

Major Hasan's 10 to 20 messages to Anwar al-Awlaki, once a spiritual leader at a mosque in suburban Virginia where Major Hasan worshiped, indicate that the troubled military psychiatrist came to the attention of the authorities long before last Thursday's shooting rampage at Fort Hood, but that the authorities left him in his post.

The New York Post quoted counter-terrorism and military officials, as saying on Monday night that the communications, first intercepted last December as part of an unrelated investigation, were consistent with a research project the psychiatrist was then conducting at Walter Reed Army Medical Center in Washington on post-traumatic stress disorder.

"There was no indication that Major Hasan was planning an imminent attack at all, or that he was directed to do anything," one senior investigator said.

He and the other officials spoke on the condition of anonymity, saying the case was under investigation. (ANI)