The Navy has been preparing to meet on Monday a flotilla carrying 47 pro-Palestinian activists to the Gaza Strip in an attempt to break the Israeli blockade.
The Navy commandos are expected to meet the four boats at an undetermined time - sometimes between the early morning hours and evening time, some dozens of kilometers from the coasts of Israel.
There are 18 passengers aboard the main boat, Swedish vessel "Marianne av Göteborg," including Joint Arab List MK Basel Ghattas, former Tunisian president Moncef Marzouki and activist Dror Feiler.
The "Marianne" is accompanied by three smaller boats: "Rachel," with eight passengers on board; "Vittorio" with nine passengers on board; and "Juliano II" with 12 passengers.
The commandos will try to take over the boats using non-violent measures and lead them to the Navy base in Ashdod.
After the takeover, the activists will be taken for questioning upon their arrival to Israel and then expelled out of the country through Ben-Gurion Airport.
The Prime Minister's Office decided to take an unusual approach to the flotilla's arrival.
The activists on board the four boats will receive a letter when they arrive in Israel welcoming them to the country and adding, "It looks like you took a wrong turn. Perhaps you meant to sail to a place not far from here - Syria. Where Assad's regime is slaughtering its people on a daily basis, and this is done with the support of Iran's murderous regime."
The letter goes on to say that "If you were truly interested in human rights, you would not be sailing in solidarity with a terror regime that executes Gaza residents without trial, and uses the children of Gaza as a human shield."
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"Here in Israel we are dealing with a reality in which terror organizations like Hamas are trying to harm innocent civilians. We are protecting the citizens of Israel against these attempts in accordance with international law," the letter continues.
"Despite this, Israel is aiding in the transfer of goods and humanitarian aid to Gaza - some 800 trucks a day, which transported over 1.6 million tons of goods over the past year ... Israel is aiding hundreds of humanitarian projects using international organizations, including building clinics and hospitals.
"However, we will not allow the transfer of weapons to terror organizations in Gaza, as has been done before through the sea. Only a year ago we thwarted an attempt to smuggle via the sea hundreds of arms meant to hurt innocent civilians."
The PMO stresses that "there is no siege of the Gaza Strip, and you are welcomed to transfer any humanitarian equipment through Israel," adding that "preventing entrance (to Gaza) through the sea is done in accordance with international law, and even has the backing of a UN committee."
The IDF, meanwhile, said the flotilla was an attempt at provocation and that its troops will not fall into any traps. The commandos taking over the boats will offer the activists food and drinks, the army said.
As a lesson learned from the takeover of the Mavi Marmara flotilla in 2010, the commandos will document the takeover and the IDF Spokesman's Office will work to quickly distribute the footage to world media before the activists could post a "victory picture" of their own.