I heard in some Spanish news that their are lots of asteroids that are coming towards the earth

The next known near-earth asteroid encounter is 26 years out, 99942 Apophis, and even that has only a very tiny chance of colliding with Earth — currently 1 in 135,000 or 0.000740000%. You're thousands of times more likely to be hit by a bus driven by Jesus. Even if we take the worst-case scenario and say this thing hits our planet, it isn't large enough to cause a global apocalypse.

As for the Spanish newscast, it would be great if you could provide a link or something, but the claim that "lots of asteroids" are headed our way is simply not substantiated by any known facts.

The only asteroid with a large enough chance of striking the earth that we know about is Apophis. Check out the asteroids page for a discussion of that asteroid and others. Also check out out the Don Yeomans page.

Don is part of the NEO (Near Earth Asteroid) search. It is his job to find anything heading our way that is big enough to cause significant damage. He wrote this blog entry at the JPL blog.