Militant Islamists are suspected to have blown up a major bridge in north-eastern Nigeria, disrupting transport links with Cameroon, residents said.
Cars and lorries loaded with goods are stranded on the highway unable to cross the Ngala Bridge, they told the BBC.
The night-time attack shows the growing threat posed by militant group Boko Haram, a BBC correspondent says.
On Tuesday, the chief of army staff said some soldiers had deserted because they were scared of Boko Haram.
The soldiers had joined the army for the wrong reason, Lt-Gen Kenneth Minimah said.
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