Iranian cancer researcher detained at Boston airport despite valid visa

An Iranian cancer researcher traveling to the US on a valid visa has been detained at Boston Logan international airport with his wife and three children, two weeks after Donald Trump’s revised travel ban came into force.

Mohsen Dehnavi was traveling to the US to work as a visiting scholar at Boston children’s hospital, which is affiliated with Harvard Medical School. But when he arrived on Monday afternoon, he was not allowed to enter the country and may now be sent home along with his family, according to a friend who was due to pick them up from the airport.
...