A suicide bomber has rammed an explosives-laden car into the security headquarters in an Egyptian border town, killing at least one person, officials said.

The front of the one-storey building in the town of Rafah collapsed and an unspecified number of troops and police are buried underneath, security officials said.

They said the bomber drove into the building at high speed.

Militants in Sinai, some with links to al Qaida, have been targeting Egyptian forces for months in the strategic peninsula bordering Gaza and Israel.

The attacks have become much more frequent and deadly since the removal in July of Egypt's Islamist president Mohammed Morsi.