Route hijacking

My bgp monitor tells me:

*> 1.2.3.0/24 203.119.76.3 0 4608 1221 4637 3561 1299 12025 ?
*> 5.4.3.0/24 202.12.28.1 0 4777 2516 1239 1299 12025 ?

These are _not_ authorized announcements, so could

  AS3561 Savvis
  AS1299 Telia
  AS1239 Sprintlink

kindly DROP these unauthorized route advertisements (and clean up their route acceptance processes so that they stop announcing unauthorized noise to the rest of the Internet).

And could the folk who run AS12025 IO-DATA-CENTERS - IO Data Centers kindly stop route hijacking?

thanks,

   Geoff