Activists speaking up against abuses in war-torn Libya face reprisals from all sides in the chaotic conflict, and are increasingly being threatened, attacked, abducted and killed, the U.N. warned in a report Wednesday.

The report, drafted by the U.N. rights office and the U.N. mission in Libya (UNSMIL) revealed a plethora of violent attacks against activists across the conflict-ravaged country, and even in some cases after they have fled abroad.

Militants with the Islamic State group killed five Islamist-backed militia fighters in an attack on a checkpoint Wednesday in the Libyan coastal city of Sirte, a local official said.

The militia fighters are part of the so-called Brigade 166 tasked by the Islamist-backed Tripoli government with securing Sirte.

Two Bangladeshi workers abducted in Libya by suspected Islamic State militants have been freed after more than two weeks, Dhaka said Wednesday.

They were among a group of nine people including four Filipinos and an Austrian reportedly taken hostage in southern Libya this month in an attack blamed on the jihadist group.

U.S. ambassador to Libya Deborah Jones has said she will stop communicating through her Twitter account after receiving a barrage of online abuse.

The abuse began after Jones tweeted on Monday about an air strike southeast of the capital Tripoli. 

The United Nations unveiled Tuesday a six-point proposal aimed at ending the violence plaguing Libya by establishing a transitional government to rule until a new constitution is adopted and elections held.

Envoy Bernardino Leon, who has been shepherding peace talks between Libya's rival parliaments, presented what the U.N. mission (UNSMIL) described as the "basis from which the parties can work" toward a solution.

Tunisia's National Bardo Museum is set to reopen to the public Tuesday after a jihadist attack that killed 20 foreigners, as the country looks to restore faith in its tourism sector.

Museum officials said the reopening, which will be marked with a ceremony, was "a message" to the gunmen who killed the tourists and a police officer there last Wednesday.

The first names for a new Libyan unity government could emerge this week after progress in U.N.-mediated talks between its warring parties, U.N. special envoy Bernardino Leon said Monday.

Leon was in Brussels for a conference of Libyan mayors after visiting Morocco, where he has been working with representatives of Libya's rival parliaments to reach a deal to end months of fighting.

The U.N.'s Libya envoy said Sunday documents to pave the way for a unity government for the "fragmented" country have been delayed but could still be ready within two days.

Speaking in Morocco, where he has been working with representatives of Libya's rival parliaments to nail down the agreement, Bernardino Leon blamed the delay on fighting around Tripoli over the past two days.

European powers and the United States welcomed renewed dialogue between Libya's rival political factions, amid U.N.-mediated talks aimed at reaching an agreement to form a unity government in the strife-torn country.

In a joint statement, France, Germany, Italy, Spain, Britain and the United States urged the participants in the talks to "enter into the discussions constructively and in good faith in order to reach agreement on a national unity government and arrangements for a ceasefire as quickly as possible."

U.N. envoy to Libya Bernardino Leon urged rival Libyan lawmakers meeting in Morocco Friday to try to nail down a political agreement within days as they began a weekend of "decisive" talks.

He said talks over the next three days will focus on security arrangements, the creation of a national unity government and confidence-building measures.