According to security officials Egypt has started to seal off smuggling tunnels into the Gaza Strip, just two days after gunmen shot dead 16 Egyptian border guards in an attack blamed partly on Palestinian Islamist terrorists. The tunnels, which are used to smuggle people to and from Gaza but also food and fuel. Israel accuses Hamas of transporting weapons into Gaza via tunnels from Egypt. Meanwhile, hundreds have mourned the death of 16 Egyptian police officers in a military funeral service with members of the public, the head of the military and senior officials marching in the procession. Egypt called the gunmen "infidels" and promised to launch a crackdown following the massacre that has strained ties with both Palestine and Israel.