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Pescara Del Tronto, Italy • As the search for survivors ground on, Premier Matteo Renzi pledged new money and measures Thursday to rebuild quake-devastated central Italy amid mounting soul-searching over why the seismic-prone country has continually failed to ensure its buildings can withstand such catastrophes.

A day after the deadly quake killed 250 people, a 4.3 magnitude aftershock sent up plumes of thick gray dust in the hard-hit town of Amatrice. The aftershock crumbled already cracked buildings, rattled residents and closed already clogged roads.

It was only one of the more than 470 temblors that have followed Wednesday's pre-dawn quake.

Firefighters and rescue crews using sniffer dogs worked in teams around the hard-hit areas in central Italy, pulling chunks of cement, rock and metal from mounds of rubble where homes once stood. Rescuers refused to say when their work would shift from saving lives to recovering bodies, noting that one person was pulled alive from the rubble 72 hours after the 2009 quake in the nearby town of L'Aquila.

"We will work relentlessly until the last person is found, and make sure no one is trapped," said Lorenzo Botti, a rescue team spokesman.

Worst affected by the quake were the tiny towns of Amatrice and Accumoli near Rieti, 60 miles northeast of Rome, and Pescara del Tronto, 15 miles farther to the east.

Many were left homeless by the scale of the destruction, their homes and apartments declared uninhabitable. Some survivors, escorted by firefighters were allowed to go back inside homes briefly Thursday to get essential necessities for what will surely be an extended absence.

"Last night we slept in the car. Tonight, I don't know," said Nello Caffini as he carried his sister-in-law's belongings on his head after being allowed to go quickly into her home in Pescara del Tronto.

Caffini has a house in nearby Ascoli, but said his sister-in-law was too terrified by the aftershocks to go inside it.

Charitable assistance began pouring into the earthquake zone in traffic-clogging droves Thursday. Church groups from a variety of Christian denominations, along with farmers offering donated peaches, pumpkins and plums, sent vans along the one-way road into Amatrice that was already packed with emergency vehicles and trucks carrying sniffer dogs.

Italy's civil protection agency said the death toll had risen to 250 by Thursday afternoon, with more than 180 of the fatalities in Amatrice. At least 365 others were hospitalized, and 215 people were pulled from the rubble alive since the quake struck. A Spaniard and five Romanians were among the dead, according to their governments.

There was no clear estimate of how many people might still be missing, since the rustic area was packed with summer vacationers.

As the search effort continued, the soul-searching began.

Premier Renzi authorized a preliminary 50 million euros in emergency funding and the government canceled taxes for residents, pro-forma measures that are just the start of what will be a long and costly rebuilding campaign. He announced a new initiative, "Italian Homes," to answer years of criticism over shoddy construction across the country, which has the highest seismic hazard in Western Europe.

But he also said that it was "absurd" to think that Italy could build completely quake-proof buildings.

Those old towns do not have to conform to the country's anti-seismic building codes. Making matters worse, those codes often aren't applied even when new buildings are built.