LONDON (Reuters) - Muslim convert and former pop star Cat Stevens returned to Britain on Thursday after his deportation from the United States over "potential" terrorism links sparked an Anglo-American diplomatic row.

"The whole thing is totally ridiculous," Stevens said on arrival at London's Heathrow airport. "Half of me wants to smile, half of me wants to growl."

Stevens, 56, was traveling with his daughter on a United Airlines flight on Tuesday from London to Washington when American officials diverted it 600 miles to Bangor, Maine.

They said he was denied entry to the U.S. because his activities could be linked to terrorism.

The move outraged British Muslims and led Foreign Secretary Jack Straw to complain personally to Secretary of State Colin Powell at the United Nations.

Straw "expressed concern that this action should not have been taken," a Foreign Office spokesman said.

Arab-Americans were also outraged by the treatment of Stevens, known as Yusuf Islam since he halted his singing and songwriting career and became a Muslim almost three decades ago.

"It's crazy," Stevens added as he was mobbed by reporters at Heathrow. "Everybody knows me from my charitable work and now there has to be explanations, but I'm glad to be home."

Asked if he felt victimized, Stevens said: "Absolutely. But you know for God's sake people make mistakes. I just hope they have made a big mistake."

PROTEST TO BUSH

U.S. Homeland Security spokesman Brian Doyle said on Wednesday that Islam was deported after his name turned up on U.S. "no fly" lists.

"Why is he on the watch lists? Because of his activities that could be potentially linked to terrorism. The intelligence community has come into possession of additional information that further raises our concern," Doyle said.

A law enforcement official who asked not to be identified said the United States had information that Islam, who last visited the United States in May, had donated money to the militant Islamic group Hamas.

A leading Arab-American group, the Council on American-Islamic Relations, sent letters to President Bush and Homeland Security Secretary Tom Ridge asking them to explain why Islam was barred.

"Yusuf Islam is perhaps one of the most widely known and respected personalities in the Muslim world. He has a long history of promoting peace and reconciliation and condemning terrorism," said Nihad Awad, the group's executive director.

Islam was denied entry to Israel in 2000 after the authorities there accused him of supporting Hamas. He denied the charges then and said his charitable donations were for humanitarian causes.

Among the charities he has supported are children affected by war in Bosnia and Iraq as well as victims of the Sept. 11, 2001, attacks against America, which he condemned.

Born Steven Demeter Georgiou in July 1947 to a Swedish mother and a Greek Cypriot father, he changed his name to Cat Stevens when he entered the music world.