Hastings distrcit councillor Damon Harvey said it wasn't the first time a council facility had faced gang conflict, as a similar attack took place at the Havelock North public pools last December.
"A library should be one of the safest public places that people can visit. It's time we start discussing a patch ban in the CBD and in public facilities such as libraries."
Hastings Mayor Sandra Hazlehurst said the 'latest increase in gang activity is not acceptable in the community.'