as john harmon reports from can kuhn and may not be an easy fix. ah see, sand and semi automatic rifles. it's the new reality for mexico's top beach destination, the caribbean resort of kang kuhn. a hot spot for spring breaking americans and european holiday makers. but one in which marines now god, the beaches. the here for a reason and can coon, over recent years, crime and violence have been on the rise. for people killed near the beach just before easter, the late his flash point. british holiday makers, sophie, kirsty, a soaking up the raises the security forces pass. you just seen all of the, the marines and the police come patrolling down the beach. what were you thinking? yeah. for a strange sight. i thought there was going to be an altercation or there was something here are throughout some same the reason that uh, maybe preventative measures are definitely cautious. and we were definitely like we were looking around to other people's reactions and seeing if anybody else's reaction. and i'm a shave, other people were scared then we'd proba