ISLAMABAD, Pakistan (AP) -- The killers of Wall Street Journal reporter Daniel Pearl never intended to free him, investigators said Saturday. Pakistani authorities have warned foreign organizations in the country to take precautions, saying the Pearl case may be part of a wider terrorist scheme.
Meanwhile, the man who delivered a grisly videotape confirming Pearl's murder was being held for questioning in the southern port city of Karachi, Interior Ministry officials in the capital, Islamabad, said on condition of anonymity.
Also Saturday, officials said they have tightened security at a Karachi detention center holding three suspects charged with sending e-mails announcing Pearl's Jan. 23 kidnapping. The move follows intelligence reports warning that Pearl's kidnappers may target the suspects because they are witnesses, said two intelligence officials in Karachi.
Pakistani authorities believe Pearl's murder may be part of a larger terrorist scheme to destabilize the country following President Pervez Musharraf's Jan. 12 pledge to rid Pakistan of Muslim extremism in the wake of the Sept. 11 terrorist attacks.
The government warned foreign missions, embassies and dignitaries to boost their security, the Interior Ministry officials said, adding that attacks on U.S. interests in Pakistan cannot be ruled out.
On Friday, President Musharraf vowed to deal with terrorists with "an iron hand." There was an outpouring of condolences and expressions of outrage from Pakistani government officials, journalists, Cabinet ministers and even some Islamic militant groups.
Four key suspects remain at large and Pearl's body has not been found. It is also unclear exactly when and where he was killed.
An intelligence official said that unless the remaining suspects are apprehended, "it will not be easy to find the remains of the slain journalist."
The official, who spoke on condition of anonymity, said an Arab national police believe helped coordinate Pearl's abduction is among those being sought. He did not elaborate.
The alleged mastermind behind Pearl's abduction, British-born militant Ahmed Omar Saeed Sheikh, has been in custody since early February. Authorities in Karachi said they continued questioning Saeed and the three suspected e-mailers for clues about the location of Pearl's body and the remaining suspects.
Two intelligence officials in Karachi, speaking on the condition of anonymity, said Saeed told interrogators that his group wanted to teach a lesson to the U.S.-led anti-terror coalition and that Pearl's murder was just a first step.
The officials said they had been optimistic about Pearl's safe recovery until the last moment, but that it now seems the extremists had kidnapped him for the purpose of killing him.
Saeed told authorities late Friday that he was not present when Pearl was killed, a senior Karachi police official said. The official also confirmed that Saeed said his group wanted to take more steps to "teach a lesson to America."
A videotape received by the U.S. Consulate in Karachi "contained scenes showing Mr. Pearl in captivity and scenes of his murder by the kidnappers," said Mukhtar Ahmad Sheikh, an official in charge of police in Sindh province, which includes Karachi.
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