find it difficult to try to prevent this kind of attacks. i think there's 60 open air christmas markets in berlin alone. >> it's time to get security companies on contract to protect large amounts of people where they congregate. if you're going to have security that's workable or that does what it's supposed to do, traditionally, security hasn't been designed for terrorism, the terror method of -- or the security method for counter terror, you want to have the three d's in place, and you can use that in the private sector, you can have undercover police officers in there as well. you have the deterrents which is the uniformed security guards. they have to be armed. there needs to be security in place, it's doable. it's time to implement it. >> i want to play you this sound from the berlin minister. he's unclear if this was an attack. listen to what he said.