US intelligence agencies learned an Army psychiatrist contacted an Islamist sympathetic to al Qaeda and relayed that information to authorities before the man allegedly went on a shooting spree that killed 13 people in Texas last week, US officials said on Monday.

While the agencies were monitoring contacts by Anwar al-Awlaki, a fiery, anti-American cleric in Yemen who sympathized with al Qaeda, they came across some communications late last year with the shooting suspect, Major Nidal Malik Hasan, US government officials said.

They said the information was given to federal authorities who determined that Hasan's writings were largely consistent with his academic work, offering no hint that he was planning an attack or was following orders from anyone.

Authorities have decided to charge Hasan, a US-born Muslim of Palestinian descent, in a military court following Thursday's shooting at the Fort Hood Army post where 30 others were also wounded, two of the government officials said.

With FBI and military officials briefing senior lawmakers late on Monday and other comments by various officials, it appeared that different parts of the government were angling to avoid being blamed for having failed to prevent the shooting.

One intelligence official said: "There's no sign at this point that the CIA had collected information relevant to this case and then simply sat on it."

The US officials spoke on the condition of anonymity because of the sensitive and ongoing nature of the investigation.

In a letter to Director of National Intelligence Dennis Blair and the heads of the FBI, CIA and National Security Agency, Representative Pete Hoekstra, the senior Republican on the House Intelligence Committee, has asked them to preserve the information the agencies have on Hasan.

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