Israel has launched a new ground offensive into Gaza City designed to dismantle Hamas infrastructure and warned residents to leave and head south.

It was not immediately clear how many people remained on Tuesday in the city.

The Mercer County Sheriff's Office in Ohio found 89-year-old Roger Stachler alive and conscious in a cornfield after a multiagency search.

The 22-year-old's mother set off a search for her when she failed to come home hours after her expected return time, rescuers say.

The National Weather Service issued air quality alerts in eight states, including Illinois, Missouri, Tennessee, Indiana and Texas.