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Olympic runner and convicted murderer Oscar Pistorius was hurt in a fight with another inmate that began over the use of a public telephone, a South African prison official has confirmed to the Associated Press.

Pistorius sustained a ‚Äúminor injury‚ÄĚ in the fight and was bruised. The condition of the other inmate was not specified, and the altercation is reportedly under investigation. A report by the Evening Standard¬†claimed that Pistorius had been taking too long on the phone with others waiting behind him and refused to hang up.

Pistorius, who was a multi-time Paralympic champ before competing in the 2012 Olympics, is serving a thirteen-year sentence for the 2013 murder of his girlfriend, Reeva Steenkamp. He’s maintained that he believed she was a home intruder when he shot her.

[Associated Press]