The nature of the investigation is unclear but comes after officials cast doubt on her US citizenship.
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Letters with 'suspicious substances' sent to US senators and election offices
A number of states have confirmed they were targeted by the mailings, including Oklahoma, Ohio and Louisiana.
Bus hits train stopped on French side of Channel Tunnel, with 19 injured
Two people were severely injured and evacuated by helicopter but no one's life appeared to be in danger, officials said.
London housing project wins top architecture award
Lion Green Road in Coulsdon was recognised for the way it responds to its surroundings.
Why Harry and Meghan's UK relaunch felt so much like a royal engagement
The Duchess of Sussex has not done anything like the day of events in Nottingham for several years on British soil.
Mother of Henry Nowak killer could be deported
Kiran Kaur was found guilty of assisting an offender and was jailed for three years in July.
Severe drought declared in parts of southern England
Reservoir levels continue to drop after a hot summer and less September rain than normal.
Severe drought declared in parts of southern England
Reservoir levels continue to drop after a hot summer and less September rain than normal.
Martinez apologises for outburst and fined by Man Utd
Manchester United defender Lisandro Martinez issues an apology following his controversial remarks criticising the club's hierarchy.
Martinez apologises for outburst and fined by Man Utd
Manchester United defender Lisandro Martinez issues an apology following his controversial remarks criticising the club's hierarchy.
Trump calls off livestream of Fort Hood attacker's execution by firing squad
Trump said some would "rather not watch" the killing of Nidal Hasan, the first military execution in over 60 years.
Katie Price 'coached' alleged victim, court told
Kieran Hayler says claims were fabricated amid the breakdown of his marriage.
Watch: What does Starlink have to do with the Ukraine-Russia war?
Ukraine's president has told Elon Musk that any restriction on the Starlink's system cost lives.
Banks say Healey is planning Budget tax raid on their profits
Senior banking executives have told the BBC they expect to be "on the menu" in the chancellor's Budget tax later this month.
Australia clinch thrilling World Cup opener against New Zealand
Australia beat New Zealand 24-22 in a dramatic Rugby League World Cup opener in Sydney, with debutant Jack Bostock scoring a hat-trick to see the hosts snatch victory late on.
Australia clinch thrilling World Cup opener against New Zealand
Australia beat New Zealand 24-22 in a dramatic Rugby League World Cup opener in Sydney, with debutant Jack Bostock scoring a hat-trick to see the hosts snatch victory late on.
Maduro pleads not guilty to new torture-related charges in New York
"I reject this document entirely," Maduro said in court, responding to newly added torture-related charges.
Russia accuses Ukraine of attacking oil refinery after Zelensky says strikes to resume
Ukraine's president says a pause on striking energy sites is over following fresh Russian attacks.
Farage defends Reform's vetting after councillors filmed making racist comments
The Reform leader says "you can't vet for future comments", after undercover filming of party activists.
Russell Brand accuser says he turned 'monster-like' before alleged rape
The 51-year-old faces three counts of rape, three charges of sexual assault and one of indecent assault.
Equality watchdog writes to Greens over 'Zionism is racism' motion
The party was reported to the Equality and Human Rights Commission by MPs and antisemitism campaigners.