POST-ARREST BLAST TIED TO UNABOMBER.

Byline: John Howard Associated Press

A bomb allegedly linked to Unabomber suspect Theodore Kaczynski exploded near his remote Montana cabin four days after his arrest, according to court records.

No one was injured in the April 7 blast. At the time, several residents heard an explosion and reported it to local authorities, including the FBI, who declined to comment.

Officials at the U.S. attorney's offices in Sacramento - where Kaczynski awaits trial on Unabomber charges - and in San Francisco declined to comment on the matter Friday. FBI officials in Sacramento could not be reached.

The device exploded during a period when agents were searching the area around Kaczynski's cabin for evidence. It was not clear whether the device was triggered deliberately or accidentally or might have been on a timer.

Previously, 16 explosions have been attributed to the Unabomber. Three people were killed and 23 injured during the shadowy bomber's 18-year terror campaign against what he believed to be the evils of a technological society.

Details of the 17th explosion were not included in the court documents, which were filed in connection with the postponement of a scheduled hearing for Kaczynski from Friday to Sept. 20.

Kaczynski's defense team sought the delay to examine a huge quantity of evidence that includes 22,000 documents and hundreds of photographs.

U.S. Attorney Charles Stevens said in a separate filing that additional evidence, including ``numerous laboratory reports,'' are expected to be made available to the defense within the next few days.

Stevens also said he hopes to obtain a computer system to store and retrieve the large amount of evidence and use it during the trial.