Japan’s top heavy metal band, Loudness, has been forced to cancel its U.S. tour after being denied entry to the nation at a Chicago airport.

The Chicago venue where they were scheduled to perform said on its website that Loudness had returned to Japan after being turned away from the United States due to the U.S. government’s tightened immigration policy, which was enacted under the administration of President Donald Trump.

Loudness released a statement and apology to fans on its official website dated April 21, which read, “We greatly regret to inform you, but due to various reasons the planned tour scheduled for the U.S. has been postponed, effective immediately.

“Loudness deeply apologizes for any inconvenience that this may cause our fans. We plan to learn from this experience, prepare more accordingly, and we promise to put on a U.S. tour again in the near future. Please wait a little while longer until that is possible."

Loudness’ record company confirmed that the four members of the band had been refused entry at the airport on April 18.

“In previous tours, we were able to enter through the hosts’ invitation, but this time it didn’t work,” said a record company official.

The band is popular in the United States and has toured the country numerous times. This time, they were scheduled to play seven dates, including in Chicago and New York.

Loudness was formed by members including guitarist Akira Takasaki and the late drummer Munetaka Higuchi. The group made its debut in 1981.