Israel calls in more reservists
The fresh call-up follows another day of intensive fighting in the region.
ISRAEL/GAZA BORDER - Israel has called up another 16,000 reservists, allowing it to potentially widen its Gaza offensive.
The territory is controlled Hamas.
More than 50 Israelis and over 1,300 Palestinians have been killed in the conflict.
Thursday's call-up follows another day of intensive fighting, in which tank shells struck a UN school where Palestinians were sheltering.
Air strikes also tore through a crowded Gaza shopping area.
At least 116 Palestinians and three Israeli soldiers were killed on Wednesday alone.
Early this morning, a number of shells fell next to a United Nations school where residents forced from their homes were seeking refuge.
Nobody was killed in the latest incident.
It comes a day after another school-turned-shelter was hit by artillery, killing more than a dozen people.
In a separate attack, 17 Palestinians were killed and 200 wounded when a market place was bombed during a humanitarian pause unilaterally announced by Israel.
Meanwhile, a joint Hamas and Islamic jihad delegation is expected to arrive in Cairo, Egypt, on Thursday evening to discuss a possible ceasefire initiative.