Friday July 22, 2011 11:20 AM EDT

Maria Shriver, Arnold Schwarzenegger's Son in ICU After Surfing Accident | Maria Shriver

Christopher and Maria Shriver

Brooks/INF

Arnold Schwarzenegger and Maria Shriver’s 13-year-old son is in serious condition in a Los Angeles-area hospital following an accident on a beach in Malibu.

A source close to Shriver confirms that Christopher Schwarzenegger was boogie boarding on Sunday, when something went wrong and he suffered a collapsed lung, broken bones and broken ribs. His mother was with him on the beach, says the source.

“Christopher has been in ICU since Sunday,” a source tells PEOPLE. “Maria has not left his side and is sleeping at hospital.”

Schwarzenegger has visited as well. Christopher’s injuries were first reported by TMZ.com

More to come …

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