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“Today will once again be a very tough day, with an extreme risk of new fires,� Spanish Prime Minister wrote on X.

The national weather agency AEMET warned of extreme fire risk in most of the country, including where the largest blazes were burning in the north and west. A heat wave which brought temperatures exceeding 40 degrees Celsius (104 Fahrenheit) on several days this month was expected to last through Monday.

Fires in the Galicia region forced the closure of several highways. The high speed rail line connecting it to Spain's capital, Madrid, remained suspended.

The fires in Spain this year have burned 158,000 hectares or 610 square miles, according to the European Union’s European Forest Fire Information System. That is an area roughly as big as metropolitan London.

In both Spain and Portugal it was the Feast of the Assumption, a major usually marked by family gatherings and religious processions.

In Portugal, nearly 4,000 firefighters were battling fires on Friday. Seven major fires were active. Authorities extended the state of alert until Sunday as high temperatures were expected to last through the weekend.

The Portuguese government on Friday requested assistance from the EU’s civil protection mechanism, a firefighting force that European countries in need can call upon. A day before, Spain received two Canadair water bomber aircraft after requesting EU help to tackle blazes for the first time ever.

In the past week, Greece, Bulgaria, Montenegro and Albania have requested help from the EU’s firefighting force to deal with forest fires. The force has already been activated as many times this year as all of last year's fire season.

On Friday, a wildfire in Greece burned out of control for a fourth day on the island of Chios, prompting several more overnight evacuations.

Two water-dropping planes and two helicopters were operating in the north of the island in the eastern Aegean Sea, where local authorities said a lull in high winds was helping firefighters early Friday.

Following a series of large fires in western Greece earlier this week, the fire service was on alert Friday outside Athens and nearby areas in the south of the country where adverse weather conditions elevated the fire risk.

The spiritual leader of the world’s Orthodox Christians Ecumenical Patriarch Bartholomew expressed solidarity on Friday with the victims of wildfires in southern Europe during prayers for the Dormition of the Virgin Mary, an important religious holiday for Orthodox Christians.

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AP writer Derek Gatopoulos contributed from Athens.