Shot US congresswoman Giffords calls for tighter gun laws

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There have been renewed calls for tighter gun controls in the US.

Former US congresswoman Gabrielle Giffords was shot in the head during a mass shooting two years ago.

She returned to Washington on Wednesday to appear before a congressional committee looking at the issue of gun control in the wake of the Sandy Hook shooting, in which 20 children were killed.

In a separate incident on Wednesday, three people were injured in a shooting in Phoenix, Arizona.

Mark Mardell reports.

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