"Hacktivists" who disagree with MasterCard Inc.'s policies claimed to have taken its website down Tuesday morning.

MasterCard's website was indeed down briefly, according to MSNBC. The owner of the Twitter account @ibomhacktivist published a tweet blaming MasterCard's predicament on its decision to not allow payments to WikiLeaks. WikiLeaks confirmed on its own Twitter account that MasterCard, Visa, PayPal and others still refuse to allow it to receive payments. MSNBC said that the @ibomhacktivist account "does not appear directly related" to the prominent hacker groups Anonymous or LulzSec.