CARACAS, Sept. 24 (Xinhua) -- The Venezuelan government announced on Monday it was investigating the collusion of Chilean, Colombian and Mexican diplomats in the failed assassination attempt on President Nicolas Maduro on Aug. 4.

Communication and Information Minister Jorge Rodriguez said on Sunday that Venezuelan authorities obtained testimonies from persons implicated in the attack who stated that personnel from the Colombian, Chilean and Mexican embassies allegedly helped or were willing to help with the attack.

On Monday, Venezuela's foreign ministry issued a press release that confirmed the testimonies "were the result of an intense investigation and they were made by several of the detainees who are implicated in the attempted assassination plot."

Via an official letter, Chile denied the allegation of involvement.

Mexico's foreign ministry called the accusations "baseless," and Colombia also said the allegations were "unsubstantiated."

"The tone and arguments used by the governments of Colombia, Chile and Mexico are questionable. Instead of clarifying the circumstances made by the confessed terrorists, they employ diplomatic restraint," the news release said.

It also said the reactions of the three countries allow Venezuela's extreme right to feel supported and protected.

The news release said the Venezuelan government expected "coherent and transparent international cooperation of these countries in order to conduct the necessary investigation."

"Venezuela's Bolivarian government will continue to objectively investigate the grave event that occurred on Aug. 4, 2018 and will continue to present to both the national and international audiences the definitive results that are discovered," said the release.

The government has arrested 28 individuals in connection with the failed assassination attempt.