Feb 2

"A Qassam rocket fired from the northern Gaza Strip landed in an open area south of the Israeli city of Ashkelon. Another Qassam rocket landed near the southern Israeli town of Sderot and a third one landed near the Al-Muntar (Erez) crossing. There were no injuries or damage resulting from the strikes. "

Feb 3

"Four Israelis were wounded when Palestinian militants fired a Qassam rocket from the Gaza Strip into southern Israel. Islamic Jihad had claimed responsibility for the attack. Two more rockets landed near Ashkelon, causing some damage. IDF artillery shelled the northern Gaza Strip. "

Feb 7

"Four Qassam rockets landed in Israel, north of the Gaza Strip. They damaged buildings, but there were no injuries. "

I can continue, but you can look at the above link and absolutely see that indiscriminate rockets attacks from Gaza into Israel in 2006 (as well as before and after).

It makes total sense for Israel to prevent movements of goods that can be used to build this sort of weaponry in Gaza.

Of course there is a wikipedia page that tracks some of these attacks for the past few decades:

https://en.wikipedia.org/wiki/Palestinian_rocket_attacks_on_...

So yes, there is a cause and effect behind so-called blockade of Gaza by Israel(ie Egypt had a border with Gaza and they chose to enforce it the way they deeemed neccessary for their national security)