Two strong earthquakes have hit north-western Iran, leaving at least 87 people dead and 400 more injured, according to state TV.
The quakes struck near the city of Tabriz and the town of Ahar, but most of the casualties are thought to be in outlying villages.
Reports say phone lines to many villages have been cut off, making rescue efforts harder.
The US Geological Service measured the quakes at magnitude 6.4 and 6.3.
Two strong earthquakes have hit north-western Iran, leaving at least 87 people dead and 400 more injured
“The quake has created huge panic among the people,” said one resident of Tabriz.
“Everyone has rushed to the streets and the sirens of ambulances are everywhere.”
The towns of Haris and Varzaqab in East Azerbaijan province were among those that suffered casualties, Khalil Saei, local crisis committee chief, told state TV, according to the Associated Press.
Officials say at least four villages have been completely destroyed, with another 60 villages suffering damage ranging from 50% to 70%.
The two earthquakes came within minutes of each other, according to seismology experts at Tehran University.
Dozens of rescue workers have been sent to the region, but the onset of darkness has hampered relief efforts.
Argentine officials confirms 49 people have been killed and at least 600 injured in the worst train crash in the country in the last 40 years.
The train hit the end of the platform at Once station in the capital Buenos Aires during the morning rush hour.
“We assume that there was some fault in the brakes,” Transportation Secretary JP Schiavi said.
Dozens of people were trapped for hours in the wreckage but all have now been successfully taken to safety.
“The train was full and the impact was tremendous,” a passenger identified as Ezequiel told local television.
Medics at the scene were overwhelmed by the casualties, he added.
“People started to break windows and get out however they could,” another eyewitness told Reuters.
“Then I saw the engine destroyed and the train driver trapped amongst the steel. There were a lot of people hurt, a lot of kids, elderly,” the eyewitness added.
Police outside Once station had to “keep back the curious and concerned as paramedics treated the injured”, eyewitness Tom said.
Argentine officials confirms 49 people have been killed and at least 600 injured in the worst train crash in the country in the last 40 years
The train had hit the barrier at about 12mph (20km/h), destroying the front of the engine and crunching the carriages behind it, JP Schiavi said.
One of the carriages was driven nearly 6m (20 ft) into the next, he added.
Survivors told local media that many people had been injured in a jumble of metal and glass.
Emergency medical system director Alberto Crescenti said that some passengers who survived had to have limbs amputated. Many suffered from arrested breathing and trauma to the thorax region.
Many are in a critical condition in the city’s hospitals and there are concerns that the death toll could rise.
Five similar accidents have occurred in and around the city in recent months.
Many parts of Argentina’s rail network are antiquated and in need of repair and this incident will increase concern about lack of investment in the system.
“This is the responsibility of a company that is known for insufficient maintenance and… improvisation,” Edgardo Reinoso of the train workers’ union told Reuters.
“Lack of controls” on the part of state agencies was also to blame, Edgardo Reinoso added.
In September 2011, 11 people died when a commuter train in Buenos Aires hit a bus crossing the tracks and then hit a second train coming into a station.
This latest accident is Argentina’s worst train crash since February 1970, when a train smashed into another at full speed in suburban Buenos Aires, killing 200 people.
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