ISIS militants on May 30 blew up the Tadmur prison complex in the central Syrian city of Palmyra, destroying an important symbol of government control. ISIS announced the destruction of the prison in a statement on social media, and posted pictures of huge clouds of smoke above the sprawling complex. The facility was reportedly emptied before it was destroyed. Days earlier, ISIS released photographs showing appalling conditions in the complex, which held dissidents and deserters from the Syrian army. Photos showed small cells with mold-streaked walls and no beds, plumbing or lighting. Nonetheless, the destruction was protested by leaders of Syria's civil resistance as eliminating substantiation of dictator Bashar Assad's crimes. "ISIS has wiped out evidence of the crimes of the Assad clan by blowing up the infamous Palmyra prison," said Syrian opposition member Mohammad Sarmini on Twitter. The fate of the detainees at the complex is not clear.

An Islamist rebel coalition led by al-Qaeda affiliate Nusra Front has made gains in northwestern Syria in recent weeks, taking the city of Idlib and the town of Jisr al-Shughour, and bringing them to the edge of government-held coastal areas north of the capital. "We will continue our focus on Damascus and on toppling this regime," Nusra leader Abu Mohamad al-Golani told Al Jazeera May 27. "I assure you, Assad's fall won't take a long time."

Bangladesh on May 25 banned an Islamist militant group suspected of involvement in the murders of atheist bloggers that sparked protests in Dhaka earlier this year. The Home Ministry's move to outlaw the Ansarullah Bangla Team (ABT) comes after police asked the government to ban the group. Police have also charged ABT followers with the 2013 murder of blogger Ahmed Rajib Haider. ABT is the sixth Islamist militant group to be banned in the country, which has seen a rise in militant attacks in recent years. The msot recent slaying of a blogger, which took place two weeks ago in Sylhet city, was claimed on Twitter in the name of al-Qaeda in the Indian Subcontinent (AQIS). AQIS previously claimed responsibility for the February slaying of  blogger Avijit Roy in Dhaka. An Islamist has been arrested in connection with his murder but not formally charged. (Channel NewsAsia, May 25)

ISIS forces are in control of most of Moammar Qaddafi's hometown of Sirte, and this week sucessfully repulsed an effort to retake the town by the Misrata-based 166 Brigade, which is aligned with the Libya Dawn rebel coalition that holds power in Tripoli. The 166 Brigade was reportedly pushed to the west after launching an attack on Nufaliya, and ISIS-held town on the outskirts of Sirte. ISIS claims to have taken 166 Brigade camps south and east of Sirte, and posted photos of what it says is seized equipment.

Kurdish forces of the People's Protection Units (YPG) are continuing to press gains against ISIS in northern Syria—even as the "Islamic State" is defeating government forces in both Syria and Iraq, taking the cities of Ramadi and Palmyra in recent days. On May 19, the YPG reported taking a number of villages and farms in the southern countryside of Sere Kaniye (Ras al-Ain) in northeast Syria's Hassakeh governorate. The YPG advance was supported by US-led air-strikes. (ARA News, May 20) The gains come as ISIS continues its campaign of ethnic cleansing against Assyrian Christians in Hassakeh. The YPG has formed an alliance with two Christian military formations, the Syriac Haras al-Khabur and Assyrian Military Council, now fighting ISIS for the towns of Sere Kaniye and Tel Temir. (ARA News, April 23)

ISIS forces on May 20 seized the Syrian city of Palmyra, known in Arabic as Tadmur and famed for its ancient ruins—built by an Arab civilization 2,000 years ago in the Greco-Roman style. The Local Coordination Committees civil resistance network said the entire city came under ISIS control after pro-regime forces staged a "strategic retreat." As ISIS has advanced on Palmyra, there has been growing concern that its archaeological treasures will fall victim to the systematic ISIS campaign of cultural cleansing that has already seen partial destruction of the Iraqi sites of Hatra and Nimrud. UNESCO director general Irina Bokova said: "The fighting is putting at risk one of the most significant sites in the Middle East, and its civilian population. I reiterate my appeal for an immediate cessation of hostilities at the site. I further call on the international community to do everything in its power to protect the affected civilian population and safeguard the unique cultural heritage of Palmyra."

The Iraqi city of Ramadi fell to ISIS over the weekend, sending 25,000 residents fleeing. Government forces defending the city reportedly abandoned their positions after days of intense fighting. Prime Minister Haider al-Abadi has called up Shi'ite militias to re-take the city. A broad front of Shi'ite militias is operating under the umbrella of the Popular Mobilization Units or Hashed al-Shaabi. the Anbar Provincial Council said Sunni tribal militias would also join the offensive to retake the city. (BBC News, Reuters, IraqNews, BasNews)

The Syrian Observatory for Human Rights reports that ISIS forces are advancing on the ruins of the ancient city of Palmyra, a UN World Heritage Site, where it is feared they will carry on their campaign against the archaeological treasures of the Fertile Crescent. ISIS militants have already seized parts of  adjacent city of Tadmur. Palmyra and Tadmur are situated in a strategic area on the road betwee Damascus and the contested eastern city of Deir al-Zour, and close to gas fields (BBC News) ISIS militants have executed 26 civilians in villages they seized near Palmyra, according to the Syrian Observatory. "Daesh executed 26 civilians, including at least 10 by beheading, after accusing them of collaborating with the Syrian regime," said the Observatory. (AFP)