Puerto Rican boxer Enrique "Kikin" Collazo is behind bars after he allegedly pushed his pregnant ex-wife during an argument, media outlets said Tuesday.

Collazo, a member of the Puerto Rican team at the 2012 London Olympic Games, was arrested at the home of his ex-wife, Jocelyn Gonzalez, with whom he has two other children.

Authorities say Collazo attacked Gonzalez, charging that she never answered the phone when he called to see when he could come see the kids, so he went to her house where they argued and started hitting each other.

Collazo told the authorities that Gonzalez slapped him and he shoved her, according to the police report.

Because of the blows, Gonzalez had to be admitted to hospital.

Collazo was eliminated in the first round of the last Olympic Games. Afterwards he announced that he was turning professional and signed a contract with Universal Promotions and Gary Shaw Promotions.

But Collazo had a lackluster professional debut last week in California, where he he had to settle for a four-round draw against Mexico's Juan Zapata.

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