RAFAH, Egypt, Aug. 29 (Xinhua) -- Egyptian authorities discovered on Sunday five secret tunnels used for smuggling goods at borders with Gaza Strip.

Four smuggling tunnels were discovered in a farm at borders in north Sinai while a fifth tunnel opening was found at a house close to borders with the besieged enclave, a security source told Xinhua on condition of anonymity.

Nobody was arrested in connection with the tunnels and no goods confiscated, the source added, pointing out that the authorities have closed the tunnel openings.

After Israel imposed a tight blockade on the Gaza Strip in 2007 and closed down all commercial crossings with the enclave, the Palestinians dug hundreds of smuggling tunnels under the Gaza- Egypt borders to use them in smuggling goods from Egypt into the besieged enclave.