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A man has filmed a giant mystery object being transported through his town with a police escort.

The YouTube user, called somiskid, captured the convoy with a lorry carrying a huge mysterious object as it rolled through Saticoy in Caifornia.

It was escorted by a police car as well as three lorries and a service vehicle late at night on Tuesday.

The middle lorry appears to be carrying a huge metal box as traffic builds up behind the slow moving vehicles.

Somiskid captioned the video "What is this thing round 2!!??' after spotting and filming a similar object five months previously."

(Image: Youtube/somiskid)

The first video, published in June, was watched more than 15,000 times.

The film maker said his latest video was captured at about 10.30 at night on Tuesday as the convoy rolled down East Ventura.

Some YouTube users claimed the box could contain state secrets or nuclear waste.

One said: "A nuclear flask. It is a shipping container that is used to transport active nuclear materials between nuclear power station and spent fuel reprocessing facilities.﻿"

(Image: Youtube/somiskid)

And another joker added: "It's the raptor cage from Jurassic Park."

Although no official explanation has been given, some confident commenters claimed the object is an electrical substation transformer.

Travis Peterson, another YouTube user, said: "It's an electrical substation transformer like someone said below. I believe they put it on it's side for easier transport. But yeah.. it's totally an alien dinosaur species from Uranus. (sic)"