the suspect is edwin rivas. he is charged with four attacks in hyattsville and mount rainier but investigators are also trying to find out if he is responsible for a series of sexual assaults along the northwest branch trail. erika gonzalez is live in the newsroom with the developments. >> police arrested rivas the same day another sexual assault happened on the northwest branch hiker/biker trail in hyattsville. maryland national capitol park police tell news 4 a 17-year-old female was nearly sexually assaulted on the trail behind the hyattsville metro around 1:00 a.m. on saturday. police say the woman's attacker came at her with a knife but she fought her way to safety. the suspect made a run for it. >> my girlfriend called for me on my work. i don't work in the night. >> reporter: later that day police arrested this man, 24-year-old edwin rivas. they say he confessed to sexual assaults at knife point in both the hyattsville and mount rainier area dating back to january. >> we already had the identification for

. >> edwin xavier rivas, charged in two sex aamounts and more charges could be filed.accused of raping a woman on buchanan street in the queens town apartments january 28th. the victim told police she was walking here around 2:30 in the morning when a man grabbed her from behind and dragged her into some bushes. that's where he sexually assaulted her at knife point. the attack has had the community on edge for months. >> this is a high crime area. this is nothing that's new or uncommon here in this area. we just all try to take the necessary steps to make sure that our family and friends and everyone will be okay. >> rivas is charged with another sex assault in hyattsville. police tell news 4 he's being investigated as a possible suspect in a series of sex assaults that happened near the west hyattsville metro. some of them were at knife point. >> this is potentially a serial rapist. >> we know for two for sure he's responsible for. there's a possibility he's a serial rapist. we don't know at this point. >> police have mounted a safety campaign posting flyers about the

are no people walking and i'm by myself rnch later that day police arrested this man 24-year-old edwin rivas. they say he confessed to sexual assaults at knife point in both the hyattsville and mount rainier area dating back to january. >> we already had the identification for one guy. we were able to use a photo spread and one of our victims was able to make an i.d. on that. we shared that information with prince george's county who in turn was also able to close one of their cases. >> reporter: you can still find composite sketches all along this trail because authorities are still not sure whether rivas had a hand in the attack that happened on this trail or whether they are looking for another suspect. >> we're currently working with surrounding agencies who are working cases that are similar and that he can possibly be responsible for. so yes. he could be responsible for other cases. >> reporter: rivas is charged with first degree rape and fourth degree sexual assault. anyone with information related to these cases is asked to call police. in hyattsville, erika gonzalez, news 4. >>> mar