BEIRUT: Lebanon鈥檚 Prime Minister Saad Hariri has received a US official as Washington mediates a maritime border dispute with Israel.

Acting Assistant Secretary of State David Satterfield arrived Tuesday, beginning a two-day visit to meet with Lebanese officials.

Satterfield鈥檚 visit comes a week after President Michel Aoun presented the US ambassador to Lebanon with a 鈥渦nified stance鈥� regarding the demarcation of the maritime border between Lebanon and Israel.

Last month, Lebanon鈥檚 Parliament Speaker Nabih Berri told the commander of the UN peacekeeping force in Lebanon, Maj. Gen. Stefano del Col, that Beirut is ready to establish the maritime border and special economic zone with Israel.

There are some 860 sq. km of waters claimed by the two countries, which are technically in a state of conflict.

Torture allegations

Separately, the UN High Commissioner for Human Rights has called for 鈥渁 thorough, effective and independent investigation鈥� into the death of a Lebanese man who was allegedly tortured by police intelligence.

Michelle Bachelet said Hassan Diqa died Saturday despite numerous interventions by a variety of UN entities with Lebanese authorities after he was allegedly tortured while detained on drug-related charges in November.

Bachelet said Tuesday that Diqa鈥檚 death 鈥渉ighlights what appears to be a number of very serious failings in Lebanon鈥檚 legal and prison systems.鈥�

She said those who ordered the crime must be held accountable.

Diqa鈥檚 father, Toufic, said his son suffered partial paralysis of his left leg. 

He was admitted to hospital in early April and remained there until his dea