STOCKHOLM (AFP) - A radicalised Swede, who was arrested after his mother reported him to the authorities, went on trial on terrorism charges on Friday (April 15) after he allegedly tried to build a bomb similar to ones used in the 2013 Boston Marathon attacks.

Sevigin Aydin, a 20-year-old teaching student who acknowledged having wanted to "die a martyr", was arrested in February by Swedish intelligence services when his mother alerted the police after finding purchases by her son of equipment often used to make bombs.

Aydin, who grew up in a leafy suburb north of Stockholm, denies any intention to carry out an attack on Swedish soil.

But the court indictment, of which AFP obtained a copy, shows that Aydin bought six bottles of acetone, matches, steel balls, a pressure cooker, electric wire and batteries.

These components can be used to make a bomb similar to the ones used by attackers during the 2013 Boston Marathon attack in the US state of Massachusetts, according to expert testimony given to the Attunda District Court, north of Stockholm.

Investigators also seized a mobile phone. Its password was "jihad".

Aydin made no secret of his sympathies for the Islamic State in Iraq and Syria (ISIS). He wanted to leave Sweden and go to Syria to "defend women and children against the infidels", according to the indictment.

He also mentioned the possibility of a strike inside Sweden.

Aydin also regularly visited militant websites to listen to sermons and "probably" tried in June 2015 to travel to Syria via Turkey, which expelled him twice.

His mother had alerted security at Stockholm Arlanda Airport, saying that she was worried he would join the militants. The trial is set to last for three days.

If found guilty, he could be sentenced to life in prison.