ATHENS (Reuters) - Greek Prime Minister Alexis Tsipras accused the opposition on Tuesday of exploiting one of the country’s worst ever natural disasters in a deepening political row over the deaths of at least 91 people in a fire.

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Greece has been stunned by the blaze which swiftly gutted the town of Mati east of Athens on July 23. Scores more people were injured and the death toll could still rise. There have since been recriminations over whether an evacuation order was issued and whether rescue services responded in a timely manner.

“I really wonder how some people ... can sleep today, and continue content in exercising their duties,” Kyriakos Mitsotakis, head of the Conservative New Democracy party, told a news conference.

“When someone undertakes political responsibility it should be accompanied by an act, and resignation is an act of personal responsibility,” said Mitsotakis, whose party is leading in opinion polls.

Though Mitsotakis did not name the prime minister, the comments appeared to be aimed at Tsipras, who has said he accepted full political responsibility for the disaster.

The prime minister’s office accused Mitsotakis of trying to “take advantage of dozens of citizens’ pain and loss”.

“Human lives cannot become an object of political exploitation,” it said in a statement.

Later, government spokesman Dimitris Tzanakopoulos said criticism was welcomed but should not be skewed by media and political opponents.

He said the environment ministry had found over 3,000 illegal constructions in forests and along the coastline in the wider Athens region, which have been marked for demolition.

TSIPRAS VOWS ACTION

“The prime minister’s decision is very clear, the government is determined to clash (with any interests) and do everything possible to prevent a repeat of any such disaster in the future,” Tzanakopoulos said during a press briefing.

Mitsotakis said those responsible for coordinating the fire response, including the civil protection and interior ministers and the fire brigade chief, should resign.

He also appeared to criticize Tsipras for failing to visit the scene of the disaster sooner. Tsipras traveled to the site on Monday a week after the blaze. Another government minister who visited earlier had a heated exchange with survivors on whether aid was sent in a timely manner.

“Anger, and sympathizing with another’s pain is something deeply personal,” Mitsotakis said. “But public figures have no right to hide during a crisis. (A leader) has an obligation to take a position, and be next to people in trying times.”

Tsipras has vowed to hold a thorough inquiry into how hundreds of people were left trapped by flames. He has pledged a series of changes, including a crackdown on unlicensed construction which is thought to have worsened the fire and blocked off escape routes for residents fleeing toward the sea.