Israel bombed more of Gaza's tallest structures on Tuesday, bringing down a 13-story apartment and office tower and destroying most of a 16-floor residential building after warning occupants to get out.

While tunnels used by Hamas to infiltrate Israel were a priority target of an Israeli offensive, many smuggling conduits into Egypt have skirted detection.

Three military leaders among at least 19 killed in Gaza attack.

Truce extended one day to allow talks on more long-term solution.

Officials say latest extension will allow more time for a finalized agreement.

Says end of rocket and mortar fire crucial to deal to end conflict.

Several challenges preventing more permanent ceasefire.

Israeli missile exploded as attempts were being made to dismantle it.

A fresh three-day ceasefire agreed between Israel and Palestinian faction Hamas in Gaza was holding on Monday. The agreement came after days of intense mediation by Egypt.

Hamas refuses any extension of the three-day truce in Gaza.