Mr Laws initially put up $500 for informati' />

The reward for a result in the rock attack on Wanganui Mayor Michael Laws' home has risen to $2100.

Mr Laws initially put up $500 for information leading to an arrest and conviction of the rock thrower.

Now listeners to Mr Laws' show on Radio Live and Wanganui residents have boosted the reward offer.

There is speculation the attack could be connected to the Wanganui District Council's rejection of a proposal to restore the letter "h" to the city's name.

Mr Laws vociferously opposed the idea.