Venezuela's state prosecutor, Tarek William Saab, told reporters he would place Guaido under investigation for "his alleged involvement in the sabotage of the Venezuelan electric grid."
It is the first government move against the US-backed Guaido since his return to Venezuela last week after defying a travel ban to visit several allied South American leaders.
- 'Electricity war' -
Maduro has blamed a devastating multi-day blackout plaguing Venezuela on Washington, and declared "victory" in what he called an "electricity war" triggered by the Pentagon.
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