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SOFIA, Bulgaria — Bulgarian officials said on Saturday that they had arrested and charged a 16-year-old student who had been radicalized by the Islamic State with planning a terrorist attack.

The Islamic State had recruited the teenager, who is from Plovdiv, in a process that started over social media, Deputy Prosecutor General Ivan Geshev said Saturday at a news conference in Sofia, Bulgaria’s capital.

“This is a classic example of recruitment and radicalization of an individual, in this case an underage person,” he told reporters, describing the case as a “personal tragedy.”

Local news media reported that the youth, who has not been named, planned to attack Plovdiv, Bulgaria’s second-largest city, but prosecutors would not comment on the location. Plovdiv, known for its Roman-era ruins and Mediterranean climate, is a popular tourist destination for Bulgarians and foreigners alike, and has been in a flurry of activity this year as European Capital of Culture.

The suspect was charged with terrorism but released to his family. He is to receive psychological counseling.

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Bulgaria, among the poorest members of the European Union, has been far from the continent’s centers of recent terrorist activity. But in describing the teenager’s recruitment, officials painted a familiar tale of radicalization by the Islamic State, also known as ISIS, one that has allowed it to build a network of fighters and carry out attacks around the world.

It started over social media and then moved to Telegram, an encrypted messaging service, the prosecutor said. He did not elaborate on the exchanges between the ISIS recruiter and the student.

A tip from relatives of the teen led the police to search two sites he frequented. There, they seized improvised explosive devices in different stages of readiness and bomb components, along with what officials described as an Islamic State flag and reading materials.

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One of the devices was a pipe bomb of a sort previously used in plots in the United States, prosecutors said. They cited an attack in Times Square in New York in 2017, in which only the bomber was injured, and bombs sent in parcels to senior Democrats, donors, and journalists last year.

The authorities in Plovdiv found another device in the making that consisted of about 31 pounds of an explosive substance stored in plastic containers, the space between containers filled with nails to cause maximum damage.

According to prosecutors, the same explosive was used in terrorist attacks in Belgium, France and at a Bulgarian airport near Burgas on the Black Sea coast, when a suicide bomber killed Israeli vacationers in 2012. U.S. intelligence traced that bombing to a Hezbollah cell active in Bulgaria.

The teenager built the devices himself over the course of a week, using publicly available explosive materials, prosecutors said.

Geshev, the deputy prosecutor general, described the teenager as “extremely intelligent” with an interest in chemistry, coming from a good family and attending one of the city’s elite high schools.