The 173 tons of Czechoslovak arms seized aboard a Danish ship were to be just the first of a series of huge weapons shipments to guerrillas in Colombia and Bolivia, Italian news media said Friday.

Italian authorities found the arms, valued at about $8.8 million, aboard the Danish freighter Jenstar on Wednesday. Italian newspapers said Friday the raid came at the end of an eight-month undercover investigation called "Operation Toys."Besides six Danish crewmen of the Jenstar, police also arrested four Belgians and an Italian accused of belonging to an international arms trafficking operation. The Italian news agency ANSA said they are charged with illegal arms trafficking and could go on trial by the middle of March.

The Rome-based daily La Repubblica said Friday that sources said there would be more arrests. It said the investigation uncovered a colossal European-based arms trafficking ring with a worldwide market and links to drug traffickers in Colombia and the United States.