Sudan has blocked an oil shipment from the new state of South Sudan, accusing it of failing to pay customs duties.
The oil was being held at the northern export hub of Port Sudan, a government spokesman in Khartoum said.
South Sudan has to export oil via the north because it has no port or refineries of its own.
Relations between the two countries have deteriorated since South Sudan became independent on 9 July, analysts say.
Khartoum's foreign ministry spokesman, Al-Obeid Meruh, said 600,000 barrels of oil was being held.
THE SUDANSESE ARE GENOCIDAL JIHADO-SCUM.
... practice mainly indigenous traditional beliefs, although some practice Christianity, as a result of Christian missionary effortsTHAT MEANS THE NON-MUSLIM SOUTH SUDANESE ARE BEING SCREWED BY THE MUSLIM SUDANESE.
AS LONG AS WE LET THE GENOCIDAL JIHADO-SCUM GET AWAY WITH CRAP LIKE THEY WILL KEEP DOING CRAP LIKE THIS (AND PIRACY ON THE SEAS).
IF WE WANT THIS TO STOP THEN WE HAVE TO WHACK THEM WITH DISPROPORTIONATE FORCE. THESE SUDANESE AND THE SOMALI PIRATES - EVERYWHERE JIHADO-TERROR POPS UP ITS UGLY LITTLE KEFFIYEH TOPPED HEAD.
AND THE SOONER, THE BETTER.