MEXICO CITY - Three major Mexican drug cartels are offering a bounty of more than $2 million to whoever kills Attorney General Rafael Macedo and a top anti-narcotics prosecutor, officials said Wednesday.

''Among the drug trafficking groups, the message has been spread that our heads have a price . . . and the offer is of more than $2 million,'' said anti-narcotics prosecutor José Luis Santiago, referring to himself and the country's top law enforcement official.

The plot involves the Tijuana, Valencia and Golfo drug cartels, which have hired hitmen known as ''Los Zetas,'' the Spanish word for the letter Z, Santiago said.