Interior Ministry officials confirmed at least 13 died in these attacks and 32 were injured.
Interior Ministry officials said they "had no information" about the arrests.
Interior Ministry officials said the attack might have carried out by terrorists, the official term for the militants.
At least 15 people were killed and more than 56 wounded, an Interior Ministry official said.
Local health officials and an Interior Ministry official said at least five people were killed.
In all, at least 108 people died across the capital, an Interior Ministry official said.
Interior Ministry officials said they were not aware of the incident.
Interior Ministry officials said three of the five people killed were women.
Two more are on their way, an Interior Ministry official said.
Interior Ministry officials said they only knew of two bodies found in the river.