THE BRONX - Tenants of the Gun Hill Houses are demanding beefed-up security after a recent string of robberies and violence. Residents of the New York City Housing Authority (NYCHA) buildings say crime there is out of control. They are demanding that NYCHA install surveillance cameras and other security measures. NYCHA says it has about $1.4 million to invest in security cameras. It says it will begin installations in several housing projects next year.