Israeli troops round up Palestinian men in northern Gaza as UN warns aid operation is ‘in tatters’

Israeli soldiers gather Friday, near the border with the Gaza Strip, southern Israel. (AP Photo/Maya Alleruzzo)

DEIR AL-BALAH, Gaza Strip — Israel said Friday that the military was rounding up Palestinian men in northern Gaza for interrogation, searching for Hamas militants, while desperate Palestinians in the south crowded into an ever-shrinking area, and the U.N. warned that its aid operation is “in tatters.”