The PA is not an enemy entity. Israel has not declared war on it. Indeed the PA was formed following the Oslo Accords to which Israel was a signatory. Far from being an "enemy entity" the PA is engaged in daily collaboration with Israeli security forces and is advised by the US - as seen by their repeated crackdowns against Hamas. The Prime Minister is a former World Bank staff member and economist. Sorry. This Israeli act is very sad.
In Cameroon, suicide bombing toll rises to 19 dead, 143 wounded (Reuters)
from the article: Israel bans Palestinian PM from East Jerusalem event