An obscure group trying to blackmail France for millions of dollars threatened in a cryptic letter to launch an attack far worse than the Madrid terror bombings. But the group, which previously claimed to have mined railway tracks, also announced a suspension of its operations so it could perfect them.
The letter came on Thursday, a day after a bomb was found half-buried on a train track near the town of Troyes, some 170km southeast of Paris, triggering a massive inspection of France's rail network.
For reasons investigators have yet to fathom, the group calls itself AZF. While it has not carried out attacks, its threats to blow up rail targets have heightened concerns -- laid bare by the Madrid train bombings -- about the vulnerability of European public transport systems.
The new single-page typed message, which carried the letters "AZF" and an arrow pointing left to right in the top left-hand corner, was received on Thursday by President Jacques Chirac's office and the Interior Ministry.
In it, AZF suggested bombs it earlier claimed to have laid under rail tracks had been neutralized while it regroups.
"There are today no longer bombs capable of functioning on the French rail network," said the letter, which the Interior Ministry released to the press. "With the experience gained these last weeks and now conscious of its technological, logistic and other weaknesses, AZF suspends its action for the time needed to remedy this."
But the group said it remains determined to extract a ransom from the government at some future date. It has earlier demanded the equivalent of US$6.4 million in dollars and euros.
"When we demand it, pay up with alacrity and let us speak no more about it. Otherwise France will surpass without glory the sad Spanish records," said the letter, which was laced with cryptic turns of phrase.
Police said they regarded the Spanish reference to mean the Madrid rush-hour train bombings on March 11, which killed 190 people and were claimed in the name of al-Qaeda.
Those attacks prompted heightened security in France and elsewhere in Europe. On Thursday, hundreds of passengers were evacuated from Amsterdam's central train station because of a bomb threat police later declared a false alarm.
AZF first contacted the government in December and then threatened last month to attack railway targets. The group directed authorities to a bomb, recovered Feb. 21, that was buried in the bed of a railway line near Limoges in central France.
That bomb and the second one found Wednesday were made from an explosive mixture of nitrates and diesel fuel. The second bomb had seven detonators, attached in the same way as the first, and both were housed in identical see-through plastic boxes, police said.
The discovery of both bombs prompted the state train authority to send some 10,000 employees out on foot to check 32,000km of track. The latest search started Wednesday evening. The previous check earlier this month found no signs of bombs or foul play.
Government spokesman Jean-Francois Cope called for calm, "because it would be a gift for terrorists of all types if we gave the feeling that we fear them."
Police have communicated with AZF using special phone lines and newspaper classified ads that addressed the blackmailers as "My big wolf." Investigators signed off as "Suzy."