Other signatories include Ghana, Nepal, Malaysia, Spain, France and China -- all countries that have contributed several hundred troops to the force.

At least five peacekeepers have been wounded in recent days as Israel takes its fight against Hezbollah into southern Lebanon.

The peacekeeping mission, UNIFIL, has accused the Israeli military of "deliberately" firing on its positions.

The 40 contributing countries "reaffirm our full support for UNIFIL's mission and activities, whose principal aim is to bring stabilization and lasting peace in South Lebanon as well as in the Middle East," the statement read.

"We urge the parties of the conflict to respect UNIFIL's presence, which entails the obligation to guarantee the safety and security of its personnel at all times," it added.

UNIFIL, which involves about 9,500 troops of some 50 nationalities, is tasked with monitoring a ceasefire that ended a 33-day war in 2006 between Israel and Hezbollah.

Its role was bolstered by UN Security Council Resolution 1701 of that year, which stipulated that only the Lebanese army and UN peacekeepers should be deployed in south Lebanon.

At a summit on Friday, French, Italian and Spanish leaders said the "attacks" on UNIFIL peacekeepers violated Resolution 1701 and must end.

UNIFIL said that, in recent days, its forces have "repeatedly" come under fire in the Lebanese town of Naqura where it is headquartered, as well as in other positions.

The mission said that Israeli tank fire on Thursday caused two Indonesian peacekeepers to fall off a watch tower in Naqura.

The following day it said explosions close to an observation tower in Naqura wounded two Sri Lankan Blue Helmets, while Israel said it had responded to an "immediate threat" near a UN peacekeeping position.

On Saturday UNIFIL said a peacekeeper in Naqura "was hit by gunfire" on Friday night.

UNIFIL spokesman Andrea Tenenti told AFP the peacekeeping mission's work had become "very difficult because there is a lot of damage, even inside the bases."