An Egyptian judge punished four Coptic Christian teenagers who were accused of insulting Islam by making fun of prayers in a video last year, the AFP news agency reported Thursday.

A lawyer for the teens told the news agency the quartet was mocking beheadings perpetrated by Islamic State extremists, and did not mean to insult the country’s most-worshipped religion.

However, they became the latest four people punished for blasphemy under Egyptian law.

Three of the teenagers received five-year jail sentences, according to the AFP report, while a 15-year-old was ordered to a serve an indefinite amount of time in a juvenile detention facility.

Their lawyer told AFP he is planning to appeal.

Egypt ranks 23rd on the World Watch List published by Open Doors USA, a group that monitors Christian persecution in countries around the world. The roughly 10 million Christians among Egypt’s 87.3 million residents face persecution from Islamic extremists and must cope with “relatively restrictive legislation related to religious affairs,” according to the organization.

AFP reported it’s also illegal to insult Christianity and Judaism in Egypt.

The Islamic State beheaded 21 Egyptian Christians last February, according to Open Doors USA.