"In such a context, it becomes more and more difficult to believe that the Guatemalan authorities are making any real progress towards returning the country to the rule of law," the human rights organization said.

"The government must now take immediate steps to address this situation by implementing effective measures to ensure protection for all members of the legal community and to conduct full investigations into threats, intimidation and attacks against them," Amnesty International added.

Amnesty International is particularly concerned that the Minister of Interior has been reported as publicly denying that the attack took place. Traditionally denial has been a common response by Guatemalan officials in response to reported human rights violations.

"In this case, however, it is strange, because one high-ranking official is casting doubts on reports from another high-ranking government official. It shows the lack of official support for those in the prosecutor's office trying to genuinely carry out their duties," Amnesty International said.