Columbine fanboy’s foiled bombing (Spain, 2012)

On October 03 of 2012, a 21 years old electronics student was arrested for plotting a bombing at the University of the Balearic Islands (Spain), where he had previously studied.

Around 10 police officers swooped on Juan Manuel Morales Sierra at 10 a.m., just after he had received a delivery of more than 300 pounds of bomb-making materials that he had purchased via internet.
Five officers had been watching him over the last five weeks from the terrace of a bar in front of his house, taking morning and afternoon shifts in order to monitor the front door of the building.
In the personal diary of Juan Manuel, and in documents the police located in his house, the suspect had written extensively about his hatred for society, in particular his fellow university students.
He had written about his plans to plant pipe bombs filled with shrapnel in the university, and was planning to take his own life as part of the massacre, according to the Interior Ministry.

Juan Manuel had been living alone for the last two months in a refurbished flat in Can Gotleu street (on the number 4), in the old town of Palma de Mallorca, which contains a large number of cheap properties for rent and is also a popular nightlife area. According to police sources, he had been raising money by playing poker and other such games online. Until then he had no police record.

The police investigation began five months before when a number of comments made by the suspect alluding to the Columbine High School massacre, were picked up on the internet. Juan Manuel expressed his sympathy for the perpetrators of the killings.
In his blog, Juan Manuel M. S. wrote about having the same musical interests as the Columbine killers and also showed an interest in weapons.
During the course of the investigation, the suspect made several attempts to acquire illegal arms as well as a firearms license, but was ultimately unsuccessful. As a result, he obtained a large amount of chemicals and explosive substances, which, as he explained in his blog, he knew how to mix to make a number of different types of bomb.

Among the materials that police found to be in his possession were 125 kilograms of ammonium nitrate, which can be used on its own as an explosive; 12 kilos of potassium nitrate; 500 grams of sodium sulfate; a liter of nitric acid and another liter of sulfuric acid. The suspect had also acquired a number of crowbars, which he was going to use to arm the bombs, and could also have been useful to force open locks of places from where he was planning to steal arms. According to his diary, he had already identified a number of targets, given his inability to get his hands on weapons any other way.
-Info taken from this article in particular:
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Some other things:
-He was sentenced to 4 years in prison.
-Forensic examinations determined that he was not mentally ill, but that he had no remorse.
-He had many online aliases, but I couldn’t find any name of the sites that he used. Some of his nicknames were: “Columbainero”, “Scary”, “Celtibero-Godo”, “Juannoventayuno”, “Juanma91”, “Juan_91”, “Meovingio”, “Chris”, “Authentic”, “Subzero91”
-The police investigation into Morales began when a Uruguayan journalist detected the presence of a young man on social networks, with the nickname "columbaneiro", who expressed admiration for the perpetrators of the Columbine massacre and said he wanted to do the same, so he looked up the phone number of the local police in Palma and warned of the risk.
-The media called him the “Unabomber of Mallorca” (or just “Unabomber”)
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A short video in English, about this:


Some pictures:

Spoiler:

It seems like bombings are among the most frequently foiled attacks. One of the few Columbine admirers that was successful in a bombing was Vladislav Roslyakov. I can't think of any others.