Court papers, previously under seal, from investigation into relationship between Weiner and a teenager girl offered no new revelations about Clinton’s emails

The FBI told a federal court it needed a search warrant to look at thousands of Hillary Clinton’s emails on the laptop of former US congressman Anthony Weiner because they had the potential to cause “grave damage to national security” if disclosed, according to court documents made public on Tuesday.

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The wording was contained in a redacted search warrant and other court papers that were previously under seal in the investigation of an online relationship between Weiner, the estranged husband of top Clinton aide Huma Abedin, and a teenage girl in North Carolina. The papers offered no new revelations about Clinton’s emails or the scope of a case that factored into the presidential election.

A sworn statement dated 30 October from an FBI agent whose name was blacked out cited a previous inquiry into Clinton’s personal computer server that found 22 emails classified “top secret”. The classification “is significant because it means that the unauthorized disclosure of those emails could result in exceptionally grave damage to national security”, the agent wrote.

In the Weiner investigation, the FBI discovered header information on emails pointing to correspondence to and from Clinton, the papers say. Given the findings of the earlier investigation, “there is also probable cause to believe that the correspondence … contains classified information which was produced by and is owned by the US government,” they say.

Facebook Twitter Pinterest Disgraced former congressman Anthony Weiner. Photograph: Jin Lee/AP

US district judge P Kevin Castel ruled on Monday that the public had a right to see the search warrant application and supporting court paperwork, but he said portions would be blacked out to protect the identity of the investigating agents. The judge also ordered the redaction of sections of the paperwork related to the ongoing investigation into Weiner’s online correspondence.

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The discovery of the emails on the disgraced New York congressman’s laptop prompted the FBI director, James Comey, to briefly reopen an investigation that he had closed over the summer into Clinton’s use of the private server to handle emails she sent and received as secretary of state.

After getting court consent to delve into the newly discovered emails on 30 October, agents spent several days analyzing them before Comey announced that they contained no new evidence of any wrongdoing by Clinton.

In statement, E Randol Schoenberg, a Los Angeles lawyer who had sued to obtain the court papers, said on Tuesday that he saw “nothing at all in the search warrant application that would give rise to probable cause, nothing that would make anyone suspect that there was anything on the laptop beyond what the FBI had already searched and determined not to be evidence of a crime, nothing to suggest that there would be anything other than routine correspondence between secretary Clinton and her longtime aide Huma Abedin”.