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By Laura Kuenssberg
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An email sent from Suella Braverman's personal account on the day she had to resign over a security breach could throw fresh doubt over her claims about the speed with which she took action.
The email, seen by the BBC, told the recipient of a highly sensitive message that Ms Braverman had sent in error to "delete and ignore" it.
She has said she reported the mistake "rapidly" to officials.
But the BBC understands it took hours for her to respond.
Ms Braverman quit as home secretary 10 days ago because she had breached security rules relating to email use. She was then reappointed by new Prime Minister Rishi Sunak.
Her reappointment has drawn criticism, with calls for an inquiry and Labour demanding Mr Sunak "comes clean" and releases assessments of the security breach.
In her defence, the home secretary said "as soon as I realised my mistake I rapidly reported this on official channels". She said she reported it to the cabinet secretary - the head of the civil service.
But the BBC understands she sent the original email from her personal Gmail account to the wrong person, a member of parliamentary staff, at 7:52 BST on 19 October.
The document was a draft written ministerial statement related to immigration visas containing highly sensitive information about government policy.
At 8:30 the recipient sent her a message saying that it had been sent in error.
At 10:02 a message was then sent from the home secretary's personal Gmail account saying: "Please can you delete the message and ignore".
It is understood the chief whip at the time, Wendy Morton, was told what had happened around half an hour later by the office that had received the message in error. Ms Morton then urgently tried to track down the home secretary to discuss the issue, it is understood.
One source told the BBC there was no evidence that Ms Braverman had raised the incident herself before she was confronted with the mistake later that afternoon, and subsequently had to resign.
But a source close to Ms Braverman said around 12:00, she instructed officials to raise the breach with the cabinet secretary. That is still more than four hours after her original email that broke the rules and two hours after she had asked the recipient to "delete and ignore".
"The home secretary has been clear that once she realised she'd made this error of judgment she proactively reported it on official channels.
"These events need to be seen in the context of a very packed schedule. She recognises she made a mistake, apologised and offered her resignation to the PM," the source said.
Ms Braverman had sent the document to her own Gmail address, before sending it on. Ministers are not permitted to send government documents to personal accounts, or to share further.
Labour's Shadow Home Secretary Yvette Cooper has Ms Braverman's appointment "raises serious doubts" about the prime minister's judgement and that the pair could not continue to hide from questions.
"Rishi Sunak's decision to reappoint Suella Braverman was deeply irresponsible," she said.
"Labour will use every parliamentary mechanism open to force government to come clean over her reappointment, to get answers and to require detailed documents to be released to the Intelligence and Security Committee."
Some Tory MPs have also expressed concern. Backbench MP Caroline Nokes backed opposition calls for an inquiry and former Tory chairman Sir Jake Berry described the breach as "really serious".