The leaders of Tanzania's main opposition party Chadema have been released on bail, a party spokesman said on Tuesday, after they were detained ahead of a youth day rally.
Blasts from the depot in the capital's Goudji area were heard miles away.
General Mahamat Idriss Deby Itno, who has led Chad's military junta for three years, was sworn in as president on Thursday after an election victory contested by the opposition.
Deby's swearing-in marks the end of three years of military rule in a country crucial for the fight against jihadism across Africa's restive Sahel region.
Chad says it has deployed combat-ready troops to stop armed attacks and maintain peace as the death toll increased to 12 people in post-election violence on Saturday.
Monday's vote aimed to end three years of military rule in a country crucial to the fight against jihadism across Africa's Sahel desert region.
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