ATHENS, Greece (AP) — Hundreds of firefighters battled wildfires in Portugal, Greece and Spain on Sunday, with Spain and Italy sending reinforcements to Portugal to help with a massive blaze burning for more than three days.

Authorities urged residents in parts of Thessaloniki, Greece's second largest city, to remain indoors and shut their windows and doors due to toxic smoke from a burning recycling plant that was engulfed by a wildfire.

Another major wildfire broke out Sunday afternoon west of the Greek capital, Athens. The fire department said 210 firefighters, backed up by volunteers, specialized teams and 29 aircraft, including water-dropping planes and helicopters, were deployed to battle the blaze burning through pine forest in the Mandra area. Authorities were racing to contain the blaze before nightfall, when aircraft can no longer perform firefighting operations.

In central Portugal’s Vouzela area, more than 1,200 firefighters backed up by nearly 400 vehicles and 15 aircraft tried to put out a blaze that broke out Thursday, according to the Civil Protection authority. The wildfire had burned across an area of 12,000 hectares (30,000 acres) by Sunday, information from the European Union’s Copernicus satellite mapping agency showed.

The EU Civil Protection and Humanitarian Aid said that Spain sent 120 firefighters and 45 vehicles as reinforcements to Portugal on Friday, while three firefighting aircraft from Italy and Spain were also dispatched to help.

By Sunday afternoon, the fire appeared to be abating somewhat, with Portuguese media quoting officials as saying it no longer had major active fronts but that some hot spots remained.

In Spain, a wildfire burning since Friday in the northeastern Girona region had burned nearly 2,200 hectares (5,400 acres), the EFE news agency said. Catalan Fire Service head of operations Eduard Martinez said the blaze had a perimeter of 40 kilometers (25 miles) and firefighters may not be able to bring it under control on Sunday, EFE said.

Toxic smoke from wildfire in northern Greece

On the other side of southern Europe, in Greece, a fast-moving blaze at a recycling plant broke out Saturday evening near the Oraiokastro suburb of Thessaloniki, triggering evacuation alerts for three suburbs and a facility housing 157 people with disabilities.

Strong winds fanned the flames, and around 160 firefighters were deployed to battle the flames through the night until water-dropping aircraft could take off at dawn, the fire department said.

Oraiokastro Mayor Pandelis Tsakiris said on Greece’s state broadcaster ERT that several businesses and homes were damaged but a clearer picture would emerge after authorities conduct a full evaluation.

A 76-year-old man was arrested on suspicion of having started the blaze through negligence by generating sparks with his vehicle that set vegetation near the road alight, the fire department said. He was due to appear before a prosecutor Sunday.

The fire came days after another wildfire in a nearby area killed a 12-year-old boy and his father.

Most fires in Greece caused by negligence, fire department says

Fire department spokesman Brig. Ioannis Artopoios, speaking on ERT TV on Sunday, said that about 85% of wildfires in Greece were caused by negligence, including through sparks generated through the use of agriculture machinery, discarded cigarettes and the use of outdoor barbecues. “This means most of them could have been avoided,” he said.

Greece suffers frequent, often devastating, wildfires during its hot, dry summers. In 2018, a blaze east of Athens killed more than 100 people, while a massive fire in 2023, which tore through a remote nature reserve in northeastern Greece, was the largest wildfire recorded in the EU.

The country has increasingly turned to technology to combat the threat of fires, exacerbated by climate change. It is integrating an array of four satellites, launched into low orbit in May, that will monitor for wildfires.

So far this summer, Greece has been spared the heatwaves that have scorched much of western Europe in recent weeks. But it has still seen dozens of blazes across the country, both on the mainland and the country's islands.

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