Police made no official statements about the raid, but local news media reported that the Egyptian, who attended the same mosque as Mohammed Saifur Rehman Khan, was inside the apartment and was being questioned as part of the investigation.

Khan, 28, is being held under Chile’s anti-terrorism laws while being investigated for alleged explosives violations.

He was detained Monday after he was summoned to the embassy because his US visa had been revoked and security equipment there detected explosive traces on his cell phone and papers.

Authorities have not said what kind of explosives were allegedly involved, though the Chilean newspaper La Segunda reported the substance detected was Tetryl, a compound used to increase the explosive power of TNT.

Colleagues and acquaintances say Khan, 28, is a calm and gentlemanly man who doesn’t fit the popular image of a terrorist. At Santiago’s EuroHotel, where Khan earned about $115 a month in a work-study position, workers said he didn’t dress luxuriously and had about three suits that he rotated. They were puzzled by the turn of events, which came just over a week after the failed car-bomb attempt in New York’s Times Square that has been blamed on a Pakistani man.

“He was a complete gentleman, very proper, like the gentlemen of old,” said Alex Garcia, head of the hotel’s reception and reservations.

“Someone who is a hotelier recognizes when another person knows the profession, and Khan knew it. He had a vocation for service and was very attentive,” said Garcia, adding that Khan seemed “tranquil, very correct and educated, speaking about five languages.” Garcia said Khan came to Chile in January to study Spanish and the hotel industry. He worked with Khan daily for almost a month and was also his Spanish instructor.

Khan said he was born in Pakistan on Aug. 21, 1982, and told of being the son of a retired doctor and from a middle-class family, Garcia said.

“I think his father, who apparently is a retired doctor, must have sent him money,” Garcia said.

Mohammed Rumie, secretary-general of Chile’s Islamic community and spokesman for the As-Salam mosque, told The Associated Press that Khan “came every Friday to the mosque, like all Muslims.”

“He didn’t appear a conflictive or problematic person — quite the opposite, he was very silent, very calm,” Rumie said.

On Tuesday, the US ambassador to Chile, Paul Simon, said there was no indication that the embassy was the target of an attack.