Islamic State slogans painted along the walls of the tunnel was used by Islamic State militants as an underground training camp in the hillside overlooking Mosul, Iraq, March 4, 2017. Photo: via Reuters Connect.

Fifteen people were arrested in the Netherlands on Tuesday on suspicion of spreading propaganda for Islamic State on TikTok and trying to persuade people to commit terrorist attacks, Dutch prosecutors said.

The arrests were triggered by a TikTok account that spread large amounts of IS propaganda with Dutch subtitles, the prosecutors said.

The TikTok posts, some with more than 100,000 views, encouraged people to join Islamic State and glorified becoming a martyr for the violent Islamist group, they said.

Thirteen of the suspects are Syrian, and four have Dutch nationality, prosecutors said, implying that some were dual nationals. Four are minors.

The suspects, aged 16 to 53, were detained in raids across the Netherlands, following the arrest last month of a person who the prosecutors said was the main suspect.

TikTok is owned by China’s Bytedance.