Kuwaiti authorities are closely monitoring several relatives of "Jihadi John" who live and work in the country where the Islamic State executioner was born, local press reports say.
A number of relatives of Mohammed Emwazi, named as the IS militant who has beheaded at least five foreign hostages, are working in Kuwait and like him hold British citizenship, al-Qabas newspaper reported.
"Security agencies have taken the necessary measures to monitor them round the clock," the paper said, citing an "informed source".
The daily did not say how many of Emwazi's relatives are in Kuwait.
Authorities have remained silent on the issue.
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Al-Rai newspaper cited security sources as saying that Emwazi's father, Jassem Abdulkareem, also a British citizen, is currently in Kuwait and is expected to be summoned by authorities.
Emwazi visited Kuwait several times, the last of them between January 18 and April 26, 2010, al-Qabas said.
He arrived from the United Arab Emirates using his British passport to obtain a Kuwaiti entry visa.
A year later, he was denied entry to Kuwait after his name came up during investigations into attacks in Britain, the newspaper said.
Emwazi told Britain's Mail on Sunday security editor Robert Verkaik he felt harassed by security services, in a series of emails in 2010, three years before he left to join IS, saying: "Sometimes I feel like a dead man walking, not fearing they (MI5) may kill me.
"Rather, fearing that one day, I'll take as many pills as I can so that I will sleep for ever! I just want to get away from these people!"
Emwazi's visits to Kuwait were largely of a social nature and he was briefly engaged to a stateless Kuwaiti resident, the paper added.
The Gulf emirate has tens of thousands of stateless residents known as bedoons.
Emwazi's family, who are of Iraqi origin, were among them.
They applied for naturalisation but their names were removed from the list of prospective citizens because of allegations that they collaborated with the Iraqi army during its seven-month occupation of Kuwait in 1990-1991, al-Qabas said.
Emwazi was born in Kuwait but moved to London in the early 1990s when he was a child and attended school and university in the British capital.
The Daily Telegraph reported that he went to school with two other boys who went on to become militants - Choukri Ellekhlifi, who was killed fighting in Syria, and Mohammed Sakr, killed fighting in Somalia.
It was also reported that Emwazi had contacts with the men responsible for failed attacks on London's public transport system in 2005, two weeks after suicide bombings killed 52 people in the British capital.
The revelations add to the pressure on the security and intelligence agencies to explain why they did not act on their suspicions about Emwazi before he travelled to Syria.
