abc7's john alston was at the scene where family and friends gathered to mourn. >> we learned the car carrying the two men who died went out of control and veered into on coming traffic seriously injuring a family of three driving in the other direction. as the sun began to set, more showed up to see for themselves the spot where they died the night before. >> they were great human beings and it is very tragic. >> nick sarmiento and his friend robbie mccann were killed. his aunt and two cousins dropped by to pay their respects. >> they loved everybody. i i don't get how it could happen. >> this was the aftermath of the grinding crash. police say witnesses said the car was driving and lost control and went into on coming traffic. >> they lost control and were speeding and they crossed into the other lane of traffic and hit a family of three which also went to the hospital. >> the other car, a day yo tau smashed into the passenger side of the honda whose roof had to be cutoff so firefighters could reach the two young men. police are promising increased traffic inforce meant -- enforceme

john alston is near the scene with more. >> reporter: alan,ight now a large scale san francisco pole department enforcement praiption is going -- operation is going on. this is lake merced boulevard a quarter mile from the intersection with john muir drive. this morning, relatives with flowers were showing up. an aunt and two cousins of one of the men who was killed, along with a 19-year-old passenger. they were apparently high school buddies. thisas the scene last night shortly after 10:30. the young men were in a honda. police are saying a toyota crashed into the passenger side of their car. it's unclear how the cars ended up perpendicular before impact, whether the honda was turning or which driver was at fault. >> aood kid. veryoving, and dependable, and helpful. he love everybody. sad thing can happen to a person like this. >> he is too young. he is only 19. >> rorter: that was an aunt. the people in the other car were seriously hurt. a mother, a father, and a daughter in the back seat, believed to be 13 years old. they're at san francisco general hospital. it's unkno if the vic

john alston is near the scene with more. >> reporter: alan, right now a large scale san francisco policet enforcement praiption is going -- operation is going on. this is lake merced boulevard a quarter mile from the intersection with john muir drive. this morning, relatives with flowers were showing up. an aunt and two cousins of

john alston reports. >> right away, federal investigators noticed something curious about the 28-foot section of the pipeline that blew out of the ground thursday night. it was not solid and seamless, rather it was made up of smaller segments welded together. n.t.s.b. wants to no why. >> there is a lot of reasons to have segmented pipe like this. it's also more expensive to have segmented pipe. >> and they confirm that pg&e had manual valves on either side of the break, not automatic valves. the pipeline that exploded was installed back in 1956 when there were fewer homes here because the area is so heavily populated now, they designated the pipe high risk. >> that certainly increases in our estimation the need to look at that issue whether there should be automatic shut-off valves whether there is some kind of massive leak in the pipe. that is the one the issues we'll be looking at. >> the latest measurement shows the crater to be 167 feet long and 26 feet wide. pg&e says they started inspecting three major gas transmission linings in the peninsula. barbara boxer is calling on state

in the news room, john alston, abc 7 news. >> more dui arrests than a year ago. 167 dui arrests wereh last night in the bay area. statewide police have arrested 990 people since the labor day holiday weekend began. that's higher than the number of arrests made during the same period of last years. the maximum enforcement effort continues until late tomorrow night. >> this morning police in pacifica are investigating a home invasion robbery. investigators say residents living in this house on mckinney avenue say two people knocked on their door just before 10:00 last night. the armed suspects forced their way in. they stoleproperty and drove away. a third suspect entered the house but the victims did not see the person's face. no one was injured. >> a lot of people in el cerrito may find alarm clocks flashing because of a power outage. pg&e said lights went out 10:40 last night. service was not restored until shortly before 1:00 this morning. officials say they're still looking into the cause of that outage. >> good thing folks won't need that alarm clock this morning. unlike us! >> g

john alston. >> if you smelled natural gas leading up to the explosion, investigators want to hear from you. california's public utilities commission set up a toll free number, 800-789-0550 or you can e-mail them. we have the information posted on our website everyone is looking for answers in the aftermath of that disaster including two top leaders who toured the site yesterday. the lieutenant governor acting as governor while schwarzenegger is out of the state and senator barbara boxer got a first-hand look at the site of the blast. the ntsb says it could take as long as 18 months to determine why the pipeline exploded. one thing they'll be reviewing are the maintenance records. >> i want to know what happened now. i don't want to wait 18 months. there's a lot of 30-inch gas pipeline throughout the state. we want to make sure it doesn't happen anywhere else. >> the leaders want to know if pg&e had an emergency response plan in san bruno and if it was carried out, answers that may come slowly from an explosion that happened so fast. in san bruno, crews searched just three streets yeste