UK government arms sales to Saudi Arabia are lawful, the High Court has ruled, after seeing secret evidence.
The court rejected claims the government was acting illegally by not suspending weapon sales to the kingdom, which is fighting a war in Yemen.
The UN claims Saudi air strikes against Houthi rebels in that country have caused thousands of civilian deaths.
The Campaign Against the Arms Trade, which brought the case, said it would appeal against the ruling.
The group had claimed the UK has contravened humanitarian law.