The Nova Scotia government is tripling a reward to try to close the book on 51 unsolved homicide and missing-persons cases.

The Justice Department is offering $150,000 for anyone who provides a tip that leads to a conviction, up from $50,000.

"Is $50,000 enough money for someone that would like to help out but is concerned about the impact of where they are, if you have to move from one town to another, change employment?" said Justice Minister Cecil Clarke. "Just from talking to people that are concerned about outstanding crimes, [they] say this is not enough."

The Justice Department says it has received some tips since the Rewards for Major Unsolved Crimes Program was launched in October 2006, though none has led to an arrest.

The cash reward is only paid if it leads to an arrest and conviction.

The 51 cases are mostly homicides around the province. They cover a range of dates, going back to 1955. A case remains in the program until the relevant police agency asks for its removal.