Investigations into Anthony Weiner's conduct opened in late September

A grand jury could hear the case against the ex-congressman as early as the end of October

The FBI, the New York Police Department, and US attorneys in New York and North Carolina have all opened investigations last month

The investigations came after DailyMail.com reported that Weiner carried on a months-long online relationship with a 15-year-old girl

Weiner and the girl traded photos and sexy messages with for several months starting in January

In one message he told he would 'bust that tight p***y so hard'

The hearing could cause a political headache for Hillary Clinton, whose top aide Huma Abedin is still officially married to Weiner, 52

As federal authorities continue to investigate Anthony Weiner's sexually charged online chats with an underage girl, DailyMail.com has learned that a grand jury could hear the case against the ex-congressman as soon as the end of the month.

The FBI, the New York Police Department, and US attorneys in New York and North Carolina opened investigations into Weiner's conduct in late September, after DailyMail.com reported that the former politician carried on a months-long online relationship with a 15-year-old high school girl.

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Weiner has already been hit with a federal subpoena for his cell phone, CNN reported last month.

The feds are apparently looking to move quickly - a federal grand jury is expected to hear allegations against Weiner in the next few weeks, sources tell DailyMail.com.

The timing of the potential hearing - shortly before the US presidential election - could cause a political headache for Hillary Clinton, whose top aide Huma Abedin is still officially married to Weiner, 52.

Abedin announced in August that she was separating from Weiner, after he was caught sending a suggestive photo of himself to another woman with his four-year-old son in the background.

Abedin and Weiner continue to share an apartment, and Clinton's political opponents have sought to tie the presidential candidate to the scandal-plagued former congressman.

After DailyMail.com reported on Weiner's conversations with the 15-year-old girl, Donald Trump called on Clinton to return any campaign donations from Weiner.

Legal experts say there are several possible avenues prosecutors might pursue if they are looking to build a case against Weiner under either New York State or federal laws.

Celebrity lawyer Joe Tacopina told DailyMail.com that Weiner could potentially face a misdemeanour of endangering the welfare of a child, which could carry up to a year in jail.

Hillary Clinton's top aide, Huma Abedin (pictured on October 15 with her son), is still officially married to Weiner, 52

Abedin announced in August that she was separating from Weiner, though they continue to share an apartment

'All you really have to do is look at the messages there to substantiate 90 per cent of her story,' said Tacopina.

Other legal experts said he could have violated federal laws against sending obscene materials to minors.

Weiner's conversations with the girl also drew criticism from New York Governor Andrew Cuomo, who said during a press conference: 'If the reports are true, it's possibly criminal and it's sick.'

The DailyMail.com first reported on Weiner's conversations with the 15-year-old girl, who he traded photos and sexy messages with for several months starting in January.

In the messages, which were obtained by the Dailymail.com, Weiner repeatedly complimented the girl's body, told her that she made him 'hard', and invited her to chat with him on the video-messaging application Skype.

One message said: 'I would bust that tight p***y so hard and so often that you would leak and limp for a week.'

Weiner and the girl used several anonymous messaging apps, like the one pictured above, where every line of text - and the sender's name - disappear after the message is opened

In one message he told he would 'bust that tight p***y so hard'

The message continues, and Weiner says he would bust that tight p***y so hard and so often that you would leak and limp for a week'

Weiner began talking to the girl in January, after she messaged him on Twitter

Weiner began talking to the girl in January, after she messaged him on Twitter.

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In the messages, the girl told Weiner she was in high school and discussed her school activities and newly acquired learner's permit.

The girl told DailyMail.com in an interview that she and Weiner also spoke over Skype, where the ex-congressman asked her to get undressed and masturbate in front of him and engage in teacher-student 'roleplaying' scenarios.

In a statement to DailyMail.com, Weiner said that he was sorry for having poor judgment with his online conversations and said he might have been the victim of a 'hoax' in this scenario.

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This is far from the first time Weiner has been entangled in a sexting scandal.

He resigned from congress in 2011 after he was caught sending photos of his crotch to a female college student, and admitted to sexting with several other women during his marriage.

In 2013, he ran for New York City mayor, but his campaign tanked after it came out that he had been exchanging sexual messages with yet another college student.

This past summer, Abedin announced that she was separating from Weiner after the New York Post reported that he had sent shirtless photos to another woman, including one that showed his four-year-old son in the background.

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After the photo was published, Child Protective Services opened up an investigation into the former congressman.