It looks obvious

NAHR AL-BARED, Lebanon, May 22 — A little-known Islamic militant group based in a Palestinian refugee camp in northern Lebanon battled government troops Monday in some of the country’s fiercest fighting since the civil war ended in 1990, surprising the Lebanese military with the scope of the group’s weaponry and financing.

Tank and artillery fire pounded blocks of the Nahr al-Bared camp, creating towers of black smoke, as the second day of fighting pushed the death toll among soldiers and militants to at least 50. Palestinian officials told news agencies that nine civilians had been killed inside the camp Monday, but there was no word of Sunday’s civilian casualties.

[...]

The Lebanese army blocked the estimated 35,000 camp residents from leaving, apparently for fear that fighters would slip out. Hospital officials in the concrete-built towns immediately surrounding the camp said they were treating some wounded civilians but refused to let a reporter interview them, citing military orders.