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Three civilians including two children have been killed in cross-border missile attacks from Yemen on a residential area in southwestern Saudi Arabia.

Eleven others were wounded, among them nine children, when several missiles hit residential districts in the Jazan region on Thursday, civil defence spokesman Major Yehia al-Qahtani said in a statement.

Saudi Arabia is leading a military coalition that has been battling the Houthi rebels in neighbouring Yemen since March.

The rebels intensified their rocket attacks across the Saudi border in recent days, prompting the coalition to threaten severe reprisals.

The Saudis have deployed Patriot missile batteries designed to counter attacks and have recently been intercepting missiles fired from Yemen on an almost-daily basis.

More than 80 people, most of them soldiers and border guards, have been killed in shelling and cross-border skirmishes in the kingdom's south since coalition operations began in Yemen.

In Yemen the conflict has left nearly 6,000 people dead since March, according to UN figures.