Niger has rounded up close to 150 migrants crossing the Sahara to Algeria in the past two days, in a crackdown on illegal migration after 92 people died of thirst trying to make the same desert journey.
A picture taken with a mobile phone and received on November 2, 2013 shows soldiers digging graves on October 30, 2013 for the bodies of some of 92 migrants who died of thirst tyring to cross the Niger desert
The grisly discovery Wednesday of the bodies of mostly women and children left stranded in the harsh Sahara desert after their trucks broke down, has prompted Niamey to clamp down on migrant trafficking networks.
A security source said Saturday that around 100 migrants, mostly men and some children, had been stopped in the desert and placed in police cells in the northern town of Arlit, a transit point for people seeking passage to Algeria.
"The migrants are being held at the gendarmerie but we do not yet know what will become of them," said the security source.
According to an aid group in Arlit, the group were travelling on board two lorries and three pick-up trucks.
Niger's government earlier announced it had "intercepted" 47 other migrants on Friday headed for Assamaka, the last town in Niger on the route to Tamanrasset, in southern Algeria.
This town had been the destination of the 92 migrants whose bodies were found decomposed in the desert.
Gut-wrenching details have emerged about the death suffered by the 52 children, 33 women and seven men in early October.
Stranded, thirsty and desperate some of them set out for help. Nineteen reached Tamanrasset alive, while another man walked to Arlit and a woman was saved by a driver who came across her in the desert.
The bodies, some of them eaten by jackals, were found in different locations across a 20-kilometre (12-mile) radius.
A resident of Tamanrasset who organised the deadly voyage has been imprisoned in Arlit, a security source said.
'We cannot remain indifferent'
A judicial investigation has been opened into the tragedy, the governor of the main northern town of Agadez Colonel Garba Maikido said on national radio.
"We cannot remain indifferent in the face of this tragedy. We must take measures so that this type of tragedy never happens again on our territory."
Maikido said that while the desert "takes lives... and will always take them... we can decrease the risks."
Niger on Friday ordered the immediate closure of migrant camps in Agadez and vowed those involved in human trafficking would be "severely punished".
"This tragedy is the result of criminal activities led by all types of trafficking networks," the government said as it announced the closure of the "ghettos", the name given to the migrant camps.
On Saturday Agadez prosecutor Samna Chaibou laid out further measures to control the flow of migrants.
He said any migrant without travel documents would be "turned back", specifying that they should have valid papers with a visa for the country they want to visit.
Niamey is also targeting people smugglers, and the drivers of vehicles transporting people across the desert will have to "declare the identity of the migrants" or face criminal charges.
The landlocked country, from where migrants try to reach Algeria or Libya is almost three times the size of California, and 80 percent of its landmass is covered by the Sahara desert.
Agadez mayor Rhissa Feltou said the 92 dead were escaping another bad harvest in the country, one of the world's poorest, hit by successive food crises in recent years. They hoped to "make a living from begging," he said.
Migrants are often found dead in the north African desert, frequently abandoned by people smugglers to their fate, but not usually on the scale of the latest tragedy.
In May 2001, about 140 people died of thirst as they were travelling through the Libyan desert.
The UN's Office for the Coordination of Humanitarian Affairs estimates that at least 30,000 economic migrants passed through Agadez between March and August of this year.
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