Four months after they were born attached at the chest and stomach – conjoined twin boys from Iraq have been successfully separated in Saudi Arabia.

The twins underwent a marathon surgery at King Abdul Aziz hospital in Riyadh on Saturday, Agence France-Presse reported.

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“The operation was carried out without any complication,” the head of the medical team, Dr. Abdullah al-Rabia, told the state news agency SPA on Monday.

The surgery, which was covered by King Abdullah, was the 20th of its kind to be carried out successfully in 18 years, according to the report.

The brothers were born in the northern Iraqi city of Mosul and transferred to Riyadh in April.