(Updates with drone strike, Aden deaths, previous DOHA) ADEN, May 22 (Reuters) - Cross border rocket attacks launched from inside Yemen have killed two people in southern Saudi Arabia over the last 24 hours, Saudi Arabia's state news agency SPA reported on Friday. SPA quoted a Civil Defence official in the southwestern province of Jizan as saying that a child was killed and three other children were wounded on Friday in the al-Tawal region. Al Masira TV channel, run by the Houthi's Ansarullah group broadcast footage earlier this week which it said showed Houthi fighters entering a Saudi border post after being fired on by Saudi tanks and helicopters.