Police in Slovenia have arrested four people, accusing them of being involved in the development of the Mariposa botnet.

"The arrests follow a joint investigation between the FBI and Slovenian police and come after the earlier arrest of three suspects in Spain, who are charged with distributing Mariposa and using it to hack into online bank accounts," writes The Register's John Leyden. "The alleged East European VXers are suspected of developing the software for the Spaniards, Slovenian news agency STA reports."

"Investigators reckon Mariposa compromised 12.7 million Windows PCs worldwide," Leyden writes.

Click here to read the article at The Register.