The rights group said selling weapons to Saudis had a devastating effect on civilians in Yemen. Germany announced it would not backtrack on the sale of patrol boats to Saudi Arabia.
Amnesty International (AI) slammed the United States and Britain on Friday for their continued arms sales to Saudi Arabia, which has been militarily engaged in neighboring Yemen's three-year civil war.
The rights group said the arms sales have been an "enormous harm to Yemeni civilians" over the course of the war, adding that all of the warring factions, including the Houthi rebels backed by Iran, have violated international law.
The Houthis have been battling the internationally recognized government that is allied with the Saudi-led military coalition. Shortly after the Houthis seized control of the Yemeni capital, Sanaa, the Saudi-led coalition began an aerial bombing campaign against the rebel forces.
"Three years on, Yemen's conflict shows no real signs of abating, and all sides continue to inflict horrific suffering on the civilian population," said Lynn Maalouf, Amnesty's Middle East research director. "Schools and hospitals lie in ruins, thousands have lost their lives and millions are displaced and in dire need of humanitarian aid.
"But this has not deterred the USA, the UK and other states, including France, Spain and Italy, from continuing transfers of billions of dollars' worth of such arms," Maalouf added. "As well as devastating civilian lives, this makes a mockery of the global Arms Trade Treaty."
Hours before the AI report was released the German government approved the sale of eight patrol boats to Saudi Arabia despite a previously agreed export ban due to the country's involvement in Yemen’s civil war.
The coalition parties in the new German government agreed during their negotiations not to sell any weapons to countries involved in the Yemen war. But a clause in the agreement exempted already approved purchases. The patrol boats fall under that clause. The previous German government was made up of the same parties in the current coalition.
World's worst humanitarian crisis
AI also criticized the Houthi rebels and other groups, accusing them of killing and injuring civilians during the war by indiscriminately bombarding residential areas.
Maalouf also accused Houthis of engaging out arbitrary arrests, detentions, forced disappearances, torture and other violations that may amount to war crimes.
The prolonged civil war has damaged Yemen's infrastructure, crippled its health system and pushed much of the country it to the brink of famine.
Two human rights groups in France said they would take legal action against the French government unless it ends sales of weapons to Saudi Arabia and its ally the United Arab Emirates within two months.