Mexico's leftist Party of the Democratic Revolution, or PRD, on Thursday urged federal authorities to assert jurisdiction over this week's murders of two PRD state legislators.

The party wants to see an exhaustive investigation in each case, PRD chair Jesus Zambrano told a press conference here.

Osbaldo Esquivel Lucatero, a member of the legislature in the western state of Michoacan, was hacked to death with a machete Wednesday afternoon near Morelia, the state capital.

His murder came less than 24 hours after Oaxaca state legislator Everardo Hugo Hernandez Guzman, another PRD member, was killed by a lone gunman in the southern city of Santa Cruz Xoxocotlan.

The characteristics of the killings indicate they could have been politically motivated, Zambrano said, asking the federal Attorney General's Office to get involved in the cases.

Another PRD official, Silvano Aureoles, said at the same press conference that the party will not tolerate any attempts to divert the investigations or slander the victims.

"We don't accept, as has already begun, conclusions about the case in Michoacan to emerge and circulate - that it was an attempted robbery, that (the slain PRD lawmaker) had ties to illicit activities," Aureoles said.

Michoacan lawmaker Esquivel Lucatero, accompanied by his brother, was being interviewed in a pick-up truck by a reporter when the fatal attack occurred. EFE