A billboard in Arabic, just east of Dearborn, Mich. campaigns against Donald Trump, saying "Donald Trump, he can't read this, but he is afraid of it."

In less than three weeks, the large Arab community in Dearborn, Mich., will be participating in the U.S election.

"In fact it's considered to be the largest concentration of Arabs outside the Middle East," said Saeed Khan, an expert on Islamic and Middle Eastern history at Wayne State University.

Some people in Dearborn say they have felt under attack during the campaign.

"My wife went to a shopping centre to buy something and suddenly found herself confronted with the security guards. Why? Because somebody walked out and said there's a terrorist in here," said Ibrahim Kazerooni, Imam at the Islamic Centre of America.

Kazerooni says he's seen a change in attitude from his neighbour. Since January, the neigbour stays away from him and his family.

"They don't want to deal with us. My children find themselves somehow isolated, that other kids don't want to talk to them," he said.

Kazerooni will vote for Clinton.

The billboard went up Oct. 18 along a stretch of Highway 94.