EMPORIA, Kansas, June 23, 2008 (AP) - Police are investigating the deaths of four birds that were killed at the Emporia zoo.

Police Chief Gary Smith said employees at the David Traylor Zoo on Sunday found two Cereopsis geese and one black swan dead from blunt force trauma and puncture wounds. Smith said a second black swan had to be euthanized because of the severity of its injuries.

According to a police statement, one or more people entered the zoo overnight and damaged a number of flower pots. Smith said it was likely the broken flower pots were used as weapons.

Interim zoo director Lisa Keith said proposals for installing security cameras are being discussed.