Originally posted by whodey
Apparently, the government of Lebanon is building a "security wall" around Palestinian refugees.
Naturally, it's not that simple; it appears that hard line Islamists from nearby Syria have fomented violence in the camps:
A likely catalyst for their closeness appears be the problems in Ain el-Hilweh refugee camp, after Islamists clashed with PLO forces last year, displacing thousands of people.
According to the article you cited, Palestinian factions agreed with the Lebanon government that a security fence is necessary at the camp making your claims of "apartheid" rather ludicrous.
Of course, Palestinians in camps in Lebanon have been vulnerable to outsiders in the past; https://en.wikipedia.org/wiki/Sabra_and_Shatila_massacre