nicole killion, cbs news, capitol hill. >>> a grim scene in britain. the murder investigation underway after dozens are found dead in the back of a truck. >>> plus, keeping your teenagers safe while behind the wheel. what chp suggests to take away cell phone temptation. >> british police have launched a murder investigation after dozens of people were found dead in the back of a semi- truck. sydney palm reports from london. >> reporter: paramedics spotted the truck on an industrial site in the county of essex about 25 miles from central london. >> sadly all 39 people inside of the container had died. >> reporter: police say all of the victims were adults except for one teenager. >> at this stage we have not identified where the victims are from or their identities and we anticipate this could be a lengthy process. >> reporter: authorities believe the truck traveled from belgium and entered the u.k. on saturday through a port in eastern england. police arrested a 25-year-old driver on suspicion of murder. >> this is unimaginable tragedy and truly heart