Even though a moratorium on capital punishement had been in place since 2003, courts in the Central Asian country had continued to sentence convicts to death in exceptional circumstances.
Rights groups put the number of those killed by Riyadh this year at 107 with Amnesty International calling the surge a 'bloody execution spree'.
Amnesty International said most of those executed were convicted "after sham trials" that relied on confessions extracted through torture.
The US Supreme Court denies state's request to vacate the Arkansas Supreme Court stay on Monday's executions. Arkansas planned to execute eight inmates before the end of April, timing it before one of its lethal injection drugs expires.
Thirty-six people convicted of killing at least 1,500 Iraqi cadets in Camp Speicher near Tikrit in 2014 have been hanged, after the Iraqi Government decided to speed up the executions of people convicted in terrorism cases.
The Iranian authorities say the members of the Tawhid and Jihad group were involved in 24 armed attacks between 2009 and 2011.
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