WASHINGTON - US President Barack Obama urged Americans on Saturday to join in solidarity as they mourn the victims of a shooting rampage at a Connecticut elementary school, saying the hearts of parents across the country were "heavy with hurt" for the lives lost.

In his weekly radio and Internet speech, Obama also repeated a message he put forth on Friday, just hours after one of the worst mass shootings in US history, on the need to set aside politics and "take meaningful action to prevent more tragedies like this."

But Obama went no further than that, and again stopped short of specifically calling for tighter gun-control laws.

Twenty children were killed by a heavily armed gunman who opened fire at a school in Newtown, Connecticut, on Friday. He killed at least 26 people there before turning his gun on himself.

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