chris palone, nbc news, dallas. >> stay with nbc 10 and the nbc 10 app for your continuing coverage of the tragedy in dallas. as well as the latest information on the other police-involved shootings that have prompted protests around the country. >>> now to a developing story from germantown where a 13-year-old girl was stabbed in the neck. it happened inside a house on the 5200 block of marion street. the girl was taken to the hospital where she's in stable condition. no one has been arrested. >>> the fire marshal believes a fast-moving fire that swept through several rowhomes in cobb's creek overnight is suspicious. investigators are looking into the possibility that the fire at 58th street and largewood avenue is related to two other fires in that same area last night. authorities say it started on the porch and then spread to several neighboring homes. >> i began banging on people's door. the fire began spreading really fast, so i ran from house to house. the fire just followed me. >> two firefighters suffered from heat exhaustion and two residents were treated for smoke inhalation

nbc's chris palone reports from dallas. >>> in dallas, more tense moments, dallas police say they received an anonymous threat against their officers and spotted what they called a suspicious person running into a parking garage near police headquarters. officers sprang into action. after a chaotic two-hour search, police say they didn't find anyone. it happened just yards where well wishers have created a memorial for the five murdered police officers. >> these officers keep us save in the community and, you know, we have to give thanks. >> just a few blocks away, investigators had the tough task of invest their own coworkers, their friends, their family. doing it on no sleep, little food and a state of shock. >> i've never felt this way. i've never had a feeling like this and it feels like a nightmare that i can't wake up from. >> police want to make sure micah johnson acted alone. they want to know when he started planning his attack, whether anyone knew about his plans and how he got his weapons. meanwhile, texas prepares for five funerals. transit officer brent thompson's body was tak