Spain's investigation into the power outage that blacked out the entire Iberian Peninsula this week continued Thursday as top security officials met Wednesday.

A widespread power outage hit Spain and Portugal, affecting millions of people who live across Europe's Iberian Peninsula.

Lights flickered back to life in Spain and Portugal on Tuesday after a massive blackout affected almost 90 percent of the Iberian Peninsula. According to AFP, barely a corner of the peninsula, which has a joint population of almost 60 million people, escaped the blackout which began on Monday.