Hashem Abedi, who assisted his brother in carrying out a suicide bombing at an Ariana Grande concert in Manchester in May of 2017, was sentenced to at least 55 years of jail imprisonment on Thursday.

Hashem Abedi was found guilty by a jury in March of 22 counts of murder, attempted murder, and plotting to cause an explosion likely to endanger life. He also encouraged his brother Salman to act as a suicide bomber at the concert. The blast had devastating effect in the packed stadium, killing 22 people and injuring an additional 237. Abedi was sentenced to 55 years of prison, as the law prohibits the imposition of a life sentence for people under the age of 21 when they commit a crime.

Justice Jeremy Barker said in his sentencing remarks that “although Salman Abedi was directly responsible, it was clear [Hashim Abedi] took an integral part in the planning.” He also said, “[t]he stark reality is that these were atrocious crimes, large in their scale, deadly in their intent, and appalling in their consequences.”

British Prime Minister Boris Johnson said that the sentencing was an “opportunity to reflect on the importance of tolerance, community and kindness – values which are fundamental to our country, and which we saw in Manchester in the face of unimaginable tragedy”.