police are battling nearly 3000 occupy wall street protesters at this hour and the crowd is refusing to leave one of the city's parks and at least one protesters has been arrested and cities across the u.s. saw similar scenes overnight because curfews were installed. 18 protesters were arrested in salt lake city and in san francisco a pair of protesters reportedly attacked police officers were knives, alleged slashing them across the hands and face. and it was like a scene out of a movie, terrified people running for their lives as a huge explosion demolished a home in fairborn, ohio. >> it sounded like a semi truck hit my house. the streets were full of smoke and coming out here running and trying to get people out of the house. this is one of the worst things i've experienced in all of my life. >> alisyn: at these seven people were hurt including three small children. fire marshals says the blast happened after a contractor accidentally struck a gas line.