MIAMI (AP) _ A federal judge dismissed a lawsuit by two American journalists seeking $28 million in damages for injuries suffered in a botched assassination attempt on Nicaraguan rebel leader Eden Pastora.

Chief U.S. District Judge James Lawrence King ruled Friday that the suit, filed last May, was improperly drafted. He dismissed it without prejudice, leaving the door open to a new filing.

Anthony Avirgan, then a free-lance cameraman with ABC News, and his wife, British Broadcasting Corp. correspondent Martha Honey, accused 30 defendants of conspiring to violate U.S. neutrality laws.

Avirgan and Ms. Honey were injured May 30, 1984, when a bomb exploded in a room filled with reporters gathered in La Pensa, Nicaragua, for an interview with Pastora. Three people were killed and 27 were injured, including Pastora.

The suit claimed the defendants had conspired to kill Pastora, known as ''Commander Zero,'' in a plot to create a military front in northern Costa Rica in their campaign against Nicaragua's Sandinista government.

Most of the defendants were rebel supporters living in the Miami area. Among them were Adolfo Calero, head of the Nicaraguan Democratic Force, and four members of Brigade 2506, a Bay of Pigs veterans' organization.