Two bottles thought to contain the deadly toxin ricin that were found at a Paris railway station last month have proved harmless.
Ricin, found naturally in castor beans, could be used by terrorists
Defence Ministry laboratory tests showed they contained a mixture of ground barley and wheat germ.
"Preliminary tests pointed towards ricin but they were not
confirmed by more complete analysis," an official said.
The barley and wheat germ have certain chemical similarities to ricin and produced misleading initial test results.
However, there will be a further round of tests by the Paris prosecutor's office.
Police found the two containers - along with two other bottles of powder and one of liquid - when they examined a left-luggage locker at the Gare de Lyon on 17 March.
Nicolas Sarkozy called for greater vigilance after the discovery
Following the discovery, Interior Minister Nicolas Sarkozy said there could be a connection with a network of Islamic
extremists who were detained around the capital in December.
The ministry initially said the contents held "traces of ricin in a mixture which has proven to be a very toxic poison".
Mr Sarkozy called for greater public vigilance.
The ministry soon downgraded the assessment, saying the traces of suspected ricin were too minute to be lethal.
Ricin is a highly dangerous toxin found in castor beans.
Police fear its use by terrorists as a biological weapon.
On 5 January, British police found traces of ricin in a raid on a
London flat during which five men of North African origin were