The Dutch public prosecution department has confirmed it decided not to prosecute a Dutch teenager who exchanged online messages with a Swedish man suspected of planning a terrorist attack on the 2020 Eurovision Song Contest in Rotterdam.

The teenager, who was a minor at the time, was investigated after a tip from Luxembourg in July 2020, the department told broadcaster NOS and website Nu.nl. The teenager had been in touch with the Swedish suspect, Alexander H, in February that year.

Prosecutors concluded after a year-long investigation that the boy had “no malicious intent” and decided not to press charges. A spokesman said the decision was strongly influenced by the teenager’s “personal problems”, but declined to give further details.

Prosecutors in Luxembourg have demanded a 12-year prison sentence for H, a 23-year-old chemistry teacher who was arrested in February 2020 at his home in Strassen. He is accused of plotting to poison Eurovision fans with cyanide or ricin, create panic using chlorine gas, and build explosives.

Luxembourg police reportedly found materials in his home to produce chlorine and explosives. The Dutch authorities and Eurovision organisers were unaware of the plans at the time, according to reports in Parool on Tuesday.

Initially, the OM said it had not received any warning from Luxembourg, but later acknowledged receiving information through informal channels.

“We received information in July 2020 about a minor suspect living in our region,” the spokesman told NOS. “He had chatted in February 2020 with a Swedish man in Luxembourg, who is suspected of preparing an attack.”

Because the message came two months after the cancelled 2020 edition of Eurovision and after H had already been detained, the information was not widely shared within the department. The contest was called off due to the coronavirus pandemic and held a year later in Rotterdam.

H, who was 17 at the time of the alleged offences, will be sentenced in November. He was released from jail in 2021.