Zapata said all five of the packages sent in recent days included similar small explosive devices disguised as USB memory sticks.
One such stick exploded Monday in the newsroom of the Ecuavisa news channel when the journalist it was addressed to, Lenín Artieda, inserted the device into a computer. The computer was destroyed but nobody was hurt.
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Ecuador officials have a suspect in custody who was responsible for the small explosives sent to journalists.
Artieda is known for his coverage of crime and corruption, but authorities have not said anything about the motive for the attacks other than to call them acts of terrorism.
Journalists at Teleamazonas, TC Televisión and Radio Exa channels also received similar packages but handed them safely over to police. A device addressed to a fifth journalist was intercepted by a courier service, Zapata said.
The Attorney General’s Office repudiated the violence and said it was investigating any act of "terrorism" against journalists.
The journalism advocacy group Fundamedios expressed its concern over the mailings as a serious threat to the security of reporters. The group said that in 2022 there 356 attacks against journalists and media outlets, the highest number since 2018.