Thirteen people, including a three-year-old child, were injured in a night-time shooting on Chicago’s South Side that police said on Friday was believed to be gang-related.

The Thursday night shooting came in the same week that a contract worker who opened fire at the Washington Navy Yard killed 12 people in the nation’s capital. Police said no arrests had been made.

Chicago has been plagued by gun violence in recent years, racking up more than 500 murders in 2012, according to a report this week by the FBI. By comparison, New York City, which has a population three times the size of Chicago, recorded 419 murders in 2012.

After Monday’s shooting, President Barack Obama has said he remained committed to strengthening gun laws. But there was little expectation of movement in Congress.

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