He named aide-de-camp Aboubacar "Toumba" Diakite as being behind the attack.
Meanwhile, neighbouring Senegal has flown a medical team to Guinea to help treat Capt Camara, officials said.
"He is injured. We don't know the degree and the nature of his injury," the Senegalese official said, quoted by AFP news agency.
The official said the plane was sent to evacuate Capt Camara to Dakar, but a report on the Guineenews website said Senegalese doctors were treating him at the junta's headquarters in Conakry.
Mr Cherif said Capt Camara, who took power in a bloodless coup last year, was at a military camp when the shooting occurred.
Reports from the city said gunfire broke out at about 1900 GMT, near a radio station and a base of the presidential guard.
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