[Dog]

Police is blocking mobile phones around the area.

Could they set off car bombs using cell phones???

[The KG9 Kid]

Yes.

[BrooklynGOP]

Could they set off car bombs using cell phones???

That's probably to prevent the terrorists from communicating with their friends...

[Eala]

Could they set off car bombs using cell phones???

Easily. I once saw a website that showed even the non-technical how to wire it with Radio-Shack-level parts (though it was intended for an electronic timer).

[mvonfr]

Police is blocking mobile phones around the area.

Could they set off car bombs using cell phones???

"Mobile" was a translation; unsure what they really meant; they may be taking down all phones.

Car bombs? -- I do not see how this is relevant. I think they are afraid of additional teams.