The 110 meter long self-propelled tanker Emma went aground on the Rhine near Cologne, Germany due to low tide.   Ten minutes later the the 86 meter long self-propelled tanker Newton went aground a short distance away.  No reports of injuries, damage or pollution released.   The Newton was loaded with 1543 tons of petroleum while the Emma was loaded with 1800 tons of diesel. The container barge Henri R later attempted to pull the Emma free.  The outcome was not reported.  The vessels may required to be lightered before other attempts are made.