Another 2,500 soldiers have arrived in the flood-hit east of Spain to reinforce efforts to locate bodies and clear debris, as government officials traded blame over how the worst flooding in decades has been handled.
Public anger is mounting over the disaster that has killed at least 217 people with dozens of others still unaccounted for.
Almost all of deaths occurred in the Valencia region and more than 60 in the suburb of Paiporta.
The army sent about 5,000 soldiers over the weekend to help distribute food and water, clean up streets and guard against looters and a further 2,500 would join them, Defence Minister Margarita Robles told state-owned radio RNE.
A warship with 104 marine infantry soldiers as well as trucks with food and water arrived in Valencia port even as a strong hailstorm pummelled Barcelona some 300km to the north.
Airport operator AENA said about 50 flights due to take off from Barcelona's partially flooded El Prat airport were cancelled or severely delayed, while 17 due to land there were diverted.
Some local train services were also cancelled.
Rescuers used drones and water pumps to search and clear underground carparks and garages.
They also scanned river mouths where currents may have deposited more bodies.
"With these drones we can send them inside the garages and have a first visual of what's going on," police spokesperson Ricardo Gutierrez said.
Opposition politicians accused the left-wing central government of acting too slowly to warn residents and send in rescuers.
Valencia's regional leader Carlos Mazon said the Hydrographic Confederation of Jucar (CHJ), which measures the flow of rivers and ravines for the state, cancelled a planned alert three times.
However, the central government said the CHJ does not issue flood risk alerts, which are the responsibility of Spain's regional governments.
Anger over delayed response and late alerts
Locals criticised late alerts from authorities about the dangers and a perceived delayed response by emergency services.
But General Javier Marcos, commander of the army's emergency response services, said he had 500 soldiers to be deployed within 15 minutes of seeing the flood warning on Tuesday who were able to enter hard-hit areas.
"The degree of destruction is so great that mobility is limited," he said. "It is so complex that it requires two things: discipline and patience."
Yesterday, some residents in Paiporta slung mud at Prime Minister Pedro Sánchez and King Felipe and his wife Queen Letizia, chanting: "murderers, murderers!"
The prime minister was also struck during the protests, Interior Minister Fernando Grande-Marlaska said in an interview on TVE, blaming a handful of extremists for the trouble.
"The majority of people gathered are absolutely peaceful people who have lost everything and whose anger we evidently understand," Mr Grande-Marlaska said.
Locals in Paiporta said anger boiled over because they felt authorities were using them for a photo opportunity.
They denied that the crowd was full of extremists.
'That's what hurts us, that they only come here for a photo’
Belen, a 50-year-old supermarket cashier who lost both her cars during the flood, said she was angry with both the national and regional governments about how slowly help has arrived.
"That's what hurts us, that they only come here for a photo," she said. "They're all the same dog with different collars.
"They're all scum."
A protest planned in Valencia on Saturday will call for regional president Carlos Mazon, of the conservative People's Party, to step down.
A daily protest in Madrid outside the headquarters of Mr Sánchez's Socialist party drew more people yesterday, about 600, due to anger over the floods, according to El Pais newspaper.
The anger vented against all sides reflects a general disillusionment with the political class, analysts at EuroIntelligence wrote in a note.
"If the aftermath turns into a big finger-pointing exercise, it will probably deepen that anti-politics sentiment," it said.
Worst flood-related disaster in Europe in five decades
Lack of clarity over numbers of dead and missing has added to frustration.
A landline has been set up for relatives to report the missing, with the government saying "dozens and dozens" are still unaccounted for.
Coroner services yesterday said 183 autopsies had been performed, and 67 people identified.
The midweek torrential rains caused rivers to swell, engulfing streets and ground floors of buildings, and sweeping away cars and masonry in tides of mud.
Sonia Luque, coordinator of the Network of Road Assistance Companies (REAC), said more than 100,000 cars were damaged.
It was the worst flood-related disaster in Europe in five decades.
Scientists have said extreme weather is more frequent due to climate change.
Meteorologists think the warming of the Mediterranean, which increases water evaporation, plays a key role in making torrential rains more severe.
Read more:
People are angry at 'apocalyptic' scenes, says Irish woman in Valencia
Before and after satellite images show Spain devastation
Destruction in Valencia shows we are in grip of dangerous climate emergency
