Greek prime minister Alexis Tsipras has visited the site of deadly wildfires outside Athens as criticism mounts over his government’s response to the disaster.

At least 91 people have died in what has become Europe’s deadliest forest fire in more than a century, officials in the country said. As many as 25 people are still unaccounted for.

Mr Tsipras visited the coastal village of Mati, where dozens of people were killed in the worst of the fire, which swept through tourist resorts near the Greek capital after breaking out last week.

“Today, I visited the site of the tragedy. I spoke with citizens, engineers, soldiers, firemen and volunteers,” Mr Tsipras wrote on Twitter after his visit. “Unspeakable grief and infinite respect for all those who waged an uneven battle with the flames, and are now waging the battle of restoration.”

However, some have criticised his government's response to the tragedy.

When defence minister Panos Kammenos visited the area last week, he was heckled by distraught survivors.

Authorities have also come under criticism for how buildings and roads were laid out in the area and an alleged lack of adequate preparation for fire season.

Dozens dead in Greece wildfires

More than 2,000 homes were damaged in the fire and roughly a quarter will have to be demolished, Greek officials said last week.

Mr Tsipras has accepted full political responsibility for the disaster and pledged a series of changes, including a crackdown on illegal and haphazard construction thought to have worsened the blaze.

Rescue crews are still searching for 25 missing people, while the remains of 28 victims have yet to be identified, the Hellenic Fire Service said.

According to records held by the Centre for the Research on the Epidemiology of Disasters in Brussels, the blaze is now the deadliest of its kind in Europe since 1900.

Greece wildfire: deadly blaze rages across holiday resorts near Athens Show all 30 1 /30 Greece wildfire: deadly blaze rages across holiday resorts near Athens Greece wildfire: deadly blaze rages across holiday resorts near Athens A house threatened by a huge blaze during a wildfire in Kineta AFP/Getty Greece wildfire: deadly blaze rages across holiday resorts near Athens A woman reacts as she tries to find her dog Reuters Greece wildfire: deadly blaze rages across holiday resorts near Athens A helicopter flies over a wildfire raging in the town of Rafina, near Athens REUTERS Greece wildfire: deadly blaze rages across holiday resorts near Athens An aerial view shows burnt houses following a wildfire in the village of Mati AFP/Getty Images Greece wildfire: deadly blaze rages across holiday resorts near Athens Firefighters, soldiers and local residents carry a hose as a wildfire burns in the town of Rafina REUTERS Greece wildfire: deadly blaze rages across holiday resorts near Athens A man walks on the beach where burned trees hug the coastline in Mati east of Athens AP Greece wildfire: deadly blaze rages across holiday resorts near Athens People bring supplies for residents rescued from the wildfire in the village of Nea Makri AP Greece wildfire: deadly blaze rages across holiday resorts near Athens Flames rise as a wildfire burns in the town of Rafina AFP/Getty Images Greece wildfire: deadly blaze rages across holiday resorts near Athens Firefighters carry a dead person AFP/Getty Images Greece wildfire: deadly blaze rages across holiday resorts near Athens Greek Prime Minister Alexis Tsipras speaks to the media during his visit to the fire brigade's operational center in Athens EPA Greece wildfire: deadly blaze rages across holiday resorts near Athens An aerial view of a burnt urban area following fire in Kineta Hellenic Ministry of Defence/AFP/Getty Greece wildfire: deadly blaze rages across holiday resorts near Athens Firefighters, soldiers and local residents carry a hose as a wildfire burns in the town of Rafina, near Athens, Greece, July 23, 2018. REUTERS/Costas Baltas COSTAS BALTAS Reuters Greece wildfire: deadly blaze rages across holiday resorts near Athens Residents react as they look at their burned house EPA Greece wildfire: deadly blaze rages across holiday resorts near Athens Rescuers and volunteers push an inflatable boat as locals are evacuated REUTERS Greece wildfire: deadly blaze rages across holiday resorts near Athens An aerial view of an urban area burnt following fire in Mati Hellenic Ministry of Defence/AFP/Getty Greece wildfire: deadly blaze rages across holiday resorts near Athens A firefighter sprays water on the fire in the town of Mati, east of Athens, Monday, July 23, 2018. Regional authorities have declared a state of emergency in the eastern and western parts of the greater Athens area as fires fanned by gale-force winds raged through pine forests and seaside settlements on either side of the Greek capital. (AP Photo/Thanassis Stavrakis) Thanassis Stavrakis AP Greece wildfire: deadly blaze rages across holiday resorts near Athens Asimina Psalti, 87, reacts as she sits outside her burned house in Mati east of Athens AP Greece wildfire: deadly blaze rages across holiday resorts near Athens A burnt forest following a wildfire in the village of Neos Voutzas AFP/Getty Images Greece wildfire: deadly blaze rages across holiday resorts near Athens People cover their faces from the smoke that fills the sky near Kineta AP Greece wildfire: deadly blaze rages across holiday resorts near Athens Smoke rise over an avenue during a forest fire in Neo Voutsa, a northeast suburb of Athens EPA Greece wildfire: deadly blaze rages across holiday resorts near Athens Melted metals from burned cars after a fire in Argyra Akti, Mati EPA Greece wildfire: deadly blaze rages across holiday resorts near Athens Firefighters look for missing persons REUTERS Greece wildfire: deadly blaze rages across holiday resorts near Athens Smoke fills the sky as members of the emergency services block a road near Kineta, west of Athens AP Greece wildfire: deadly blaze rages across holiday resorts near Athens Burnt cars at the village of Mati AFP/Getty Images Greece wildfire: deadly blaze rages across holiday resorts near Athens Cars are blocked at the closed National Road AFP/Getty Greece wildfire: deadly blaze rages across holiday resorts near Athens A woman sprays water outside her house that was damaged in the wildfires near the village of Neos Voutzas AP Greece wildfire: deadly blaze rages across holiday resorts near Athens Smoke from a wildfire burning outside Athens is seen over the Parthenon temple atop the Acropolis hill REUTERS Greece wildfire: deadly blaze rages across holiday resorts near Athens An aerial view shows burnt houses following a wildfire in the village of Mati AFP/Getty Images Greece wildfire: deadly blaze rages across holiday resorts near Athens Flames are seen next to firefighting vehicle during a forest fire in Neo Voutsa EPA Greece wildfire: deadly blaze rages across holiday resorts near Athens People look inside a burnt car REUTERS

Meanwhile, video has emerged of dozens of people sheltering in the sea as they were driven out of homes and holiday villas in Mati during the height of the blazes.

The vast majority of victims died in the fire itself, though a number drowned in the sea while fleeing the flames.

Dozens of volunteer divers, some of them retired Navy Seals, ventured into the sea again Sunday to look for more bodied of possible victims before bad weather called off the search prematurely.

Greek authorities believe the fire resulted from arson and turned so deadly because winds of up to 62 miles per hour buffeted the pine-forested seaside resorts at the time.