A Palestinian student from Lebanon who was set to begin his freshman year at Harvard was denied entry to the United States after immigration...

A Palestinian student from Lebanon who was set to begin his freshman year at Harvard was denied entry to the United States after immigration officials objected to his friends’ social media posts, he said this week, prompting furor among free-speech advocates.

The student, Ismail B. Ajjawi, 17, landed at Logan International Airport in Boston on Friday, and was turned back by a Customs and Border Protection agent, according to an account he gave The Harvard Crimson, a student newspaper.

Mr. Ajjawi, a resident of Tyre, Lebanon, said in the account that his phone and laptop were searched and that he was questioned at the airport about his friends’ social media activity. He wrote that an agent had yelled at him and “said she found people posting political points of view that oppose the U.S. on my friend list.”

He told the agent that he should not be held responsible for others’ posts, the statement said.

“I responded that I have no business with such posts and that I didn’t like, share or comment on them and told her that I shouldn’t be held responsible for what others post,” he wrote.

He added, “I have no single post on my timeline discussing politics.”

Mr. Ajjawi told The Crimson that his visa was then canceled and that he was sent back to Lebanon. Classes at Harvard are set to begin Sept. 3.

Michael S. McCarthy, a spokesman for Customs and Border Protection, said he could not comment on the specifics of Mr. Ajjawi’s case because of privacy rules.

“This individual was deemed inadmissible to the United States based on information discovered during the CBP inspection,” the agency said in a statement.

The statement noted that foreign visitors must “demonstrate they are admissible into the U.S. by overcoming all grounds of inadmissibility including health-related grounds, criminality, security reasons, public charge, labor certification, illegal entrants and immigration violations, documentation requirements, and miscellaneous grounds.”

Mr. McCarthy noted that Mr. Ajjawi could reapply for a visa.

Reached through an intermediary, Mr. Ajjawi declined to comment and referred questions about his case to his lawyer, Albert Mokhiber. Mr. Mokhiber did not immediately respond to requests for comment on Tuesday.

The action that Mr. Ajjawi said was taken against him was widely criticized by free-speech advocates, who argued that denying a student the chance to begin classes at one of the world’s foremost universities over social media posts written by other people, as Mr. Ajjawi contended had occurred, was unfair and alarming.

They said Mr. Ajjawi’s case highlighted the potential dangers of a policy announced by the Trump administration last year that nearly all applicants for a visa to enter the United States would be asked to submit their social media user names for the past five years.

Sarah McLaughlin, the director of targeted advocacy for the Foundation for Individual Rights in Education, said that there had been “numerous recent accusations that U.S. immigration officials are denying visas on the basis of political viewpoints.”

“Ajjawi’s allegations, if accurate, represent a threat to academic freedom, one that should be taken seriously by those who care about protecting expressive freedoms in the United States,” she said.

Summer Lopez, senior director of Free Expression Programs at PEN America, said in a statement that “preventing people from entering the country because their friends critiqued the U.S. on social media shows an astounding disregard for the principle of free speech.”

Carrie DeCell, a lawyer on staff at the Knight First Amendment Institute at Columbia University, said in a statement that the case underscored the problems with giving the government broad authority to trawl through travelers’ data.

“The chilling effects of incidents like these ripple through communities far beyond Harvard’s incoming freshman class, resulting in widespread self-censorship on social media and threatening intellectual freedom,” she said.

In a statement, Harvard said that it was “working closely with the student’s family and appropriate authorities to resolve this matter so that he can join his classmates in the coming days.”

In a video posted last week on the Facebook page of Al Araby, a London-based Arabic broadcaster, Mr. Ajjawi said in an interview that he wanted to pursue a career in medicine. He said that his acceptance to Harvard “shows that Palestinians can succeed and excel despite all the pressure on them.”

Last month, the university president, Lawrence S. Bacow, wrote a letter to Mike Pompeo, the secretary of state, and Kevin McAleenan, the acting secretary of Homeland Security, expressing concern about the student visa process. He noted the crucial role that students, faculty and researchers from across the globe play in the university’s work.

“Increasingly, visa delays are making these scholars’ attendance and engagement in the university unpredictable and anxiety-ridden,” he wrote. “Students report difficulties getting initial visas — from delays to denials. Scholars have experienced postponements and disruptions for what have previously been routine immigration processes such as family visas, renewals of status, or clearance for international travel.”

Anemona Hartocollis contributed reporting.

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