The US Customs and Border Protection (CBP) has detained an Iranian cancer researcher and his family for more than 24 hours at Logan International Airport in the US, despite the man carrying a valid work visa.

Dr Mohsen Dehnavi, who was travelling with his wife and three children to Massachusetts to conduct postdoctoral research at Boston Children’s Hospital, was detained at the airport and put on a return flight to Iran.

CBP spokeswoman Stephanie Malin was quoted by Washington Post as saying: “This individual was deemed inadmissible to the US based on information discovered during the CBP inspection.”

The detention happened two weeks after the Supreme Court allowed the Trump administration to partially enforce an executive order denying entry to people travelling from Iran and five other Muslim-majority countries, reported the Boston Globe.

"This individual was deemed inadmissible to the US based on information discovered during the CBP inspection."

According to Boston Children's Hospital and immigration law specialists, Dr Dehnavi’s detention and deportation from the US were not related to the travel ban.

However, officials from the CBP did not divulge any reason behind the family’s expulsion, citing privacy laws.

Malin added: “In order to demonstrate that they are admissible, the applicant must overcome all grounds of inadmissibility including health-related grounds, criminality, security reasons, public charge, labour certification, illegal entrants and immigration violations, documentation requirements, and miscellaneous grounds.”

Boston Children’s Hospital had requested the customs officials to allow Dr Dehnavi and his family to enter the country.