Police are on high alert in a Chicago neighbourhood where seven people were killed in a 12-hour period.

Michael Jackson’s personal chef has described for jurors the home lives of the pop superstar’s children during the final months of the singer’s life and their continuing grief over their father’s death nearly four years ago.

Jermaine Jackson has said he regrets the recent turmoil that has embroiled his family and hopes it can be resolved peacefully and privately.