Yes, the attack was pre-planned.

Age (Australian newspaper)

Lebanese army admits ordering attack

But a senior diplomatic source, who spoke to The Age on condition of anonymity, said the tree was on Israel's side of the border and that preliminary investigations by UN personnel monitoring the border had indicated that the Lebanese army planned the attack.

Lebanese army admits ordering attack

SENIOR Lebanese army commanders have admitted authorising Tuesday's cross-border attack that killed an Israel Defence Forces colonel supervising the removal of a tree.

Guy Bechor (Interdisciplinary Centre at Herzliya Israel)

Lebanese army admits ordering attack

Israeli Arab affairs expert Guy Bechor, a senior analyst at the Interdisciplinary Centre at Herzliya, north of Tel Aviv, said it was clear the affair was planned by the Lebanese army.

Abdul Rahman Chehaitly (Lebanese Army general)

Lebanese army admits ordering attack

According to Lebanese newspaper al-Safir, General Chehaitly told the meeting the shooting incident was the result of a command decision.

Amnon Lipkin-Shahak (Israeli Defense Forces chief of staff)

Lebanese army admits ordering attack

Speaking on Israel Army Radio, former IDF chief of staff General Amnon Lipkin-Shahak said it appeared certain that senior Lebanese army commanders had planned the attack.

Government of Israel

Lebanon, Israel -- A return to war?

At that point, at least one Lebanese sniper opened fire on Israeli positions in what Israel claims was a premeditated attack.

No, the skirmish was not pre-planned.

Selim el-Sayegh (Lebanese Minister of Social Affairs)

As it happened: Clashes at the Israel-Lebanon border | Al Jazeera Blogs

3:20pm: Selim el-Sayegh, Lebanon's minister of social affairs (and a member of the Phalange party), told Al Jazeera that he didn't believe the Lebanese army instigated the fighting (as the Israeli government has alleged).