WASHINGTON — Federal prosecutors are preparing grand jury subpoenas to investigate Obama-era intelligence officials who produced an assessment finding Russia interfered in the 2016 presidential election in a bid to help Donald Trump, according to two sources familiar with the matter.

The grand jury subpoenas will request a broad swath of records, including paper or digital documents, text messages and emails associated with the preparation of the Intelligence Community’s January 2017 assessment, said the two sources, who were granted anonymity to speak because grand jury matters are secret.

Reuters could not determine whether the subpoenas have been issued or to whom they will be directed.

The investigation is being led by Jason Reding Quinones, the U.S. attorney for the Southern Distri

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