With three days of balloting, government hoping for high turnout to grant legitimacy to referendum on constitutional change

Groups warns of return to autocratic system as Egyptians go to polls for three days of balloting on letting president stay in power until 2030

Proposed changes are seen by critics as another step back toward authoritarianism

Amendments will let strongman leader to rule for 2 more 6-year terms; critics fear upcoming vote on article might allow military more influence in political life

Meeting comes amid military offensive by Libyan commander to take capital Tripoli; UN health agency says fighting has killed 121 people in 10 days

Egypt's leader defends the use of the death penalty, which UN rapporteur says is designed to crush dissent

Cairo reportedly skeptical about seriousness of White House-led Middle East Security Alliance initiative