The Solomons Islands police say a reward offer for information about an attack on a boat indicates they are extremely serious about finding those responsible.
In December 2014 a vessel chartered by politicians was shot at and set on fire at Mbike Island in Central Province.
Five people have been committed to trial which is due to start next year but police investigations have been plagued by delays.
The Commissioner Frank Prendergast said he hoped the reward of up to $US12,000 would entice people who are withholding information to come forward.
"We believe from our inquiries that there are people in the community who have information about this matter who haven't come forward. The reward's designed to attract those people to come forward and provide that information so we can deal with it," said Frank Prendergast.
Frank Prendergast says the reward is conditional on information leading to the apprehension and prosecution of those responsible.