Kofi Annan, UN envoy, said if President Bashar al-Assad is to meet the April 10 deadline of withdrawing troops from Syrian towns, all fighting must end by 6am local time on April 12.
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Families and rebel fighters are believed to be among the people to have left besieged Aleppo on Saturday through safe corridors.
The balloon came down near Lockhart, Texas, around 8.30am local time.