(KUNA) -- Ezzidin Al-Qassam Brigades, the military wing of Hamas, on Thursday declared death of an activist late on Wednesday while digging an underground tunnel at a border location.In a statement, the brigades identified the Palestinian as 24-year-old Mohammed Thaheer, adding that he lost his life when a tunnel he was digging, along with other activists in the border town of Rafah, collapsed. The deadly accident coincided with a war of words between Egypt and Israel over the clandestine border tunnels, through which the Palestinians reportedly smuggle arms and other items. Israel charges Cairo is not doing enough to stop smuggling to the Hamas-controlled Gaza through these tunnels.