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Beirut • A suspected chemical attack in a town in Syria's rebel-held northern Idlib province killed dozens of people on Tuesday, opposition activists said, describing the attack as among the worst in the country's six-year civil war.

Hours later, a small field hospital in the region was struck and destroyed, according to a civil defense worker in the area. There was no information if anyone was killed in that attack.

The Britain-based Syrian Observatory for Human Rights monitoring group put the death toll from the gas attack at 58, saying there were 11 children among the dead. Meanwhile, the Idlib Media Center said dozens of people had been killed.

The media center published footage of medical workers appearing to intubate an unresponsive man stripped down to his underwear and hooking up a little girl foaming at the mouth to a ventilator. It was not immediately clear if all those killed died from suffocation or were struck by other airstrikes occurring in the area around the same time.

It was the third claim of a chemical attack in just over a week in Syria. The previous two were reported in Hama province, in an area not far from Khan Sheikhoun, the site of Tuesday's alleged attack.

Tuesday's reports came on the eve of a major international meeting in Brussels on the future of Syria and the region, to be hosted by the E.U.'s High Representative Federica Mogherini.

There was no comment from the government in Damascus in the immediate aftermath of the attack, which activists said was the worst since the 2013 toxic gas attack on the Damascus suburb of Ghouta that killed hundreds of civilians. That attack, which a U.N. report said was an attack by toxic sarin gas, was the worst in Syria's civil war.

In the wake of the 2013 attack, President Bashar Assad agreed to a Russia-sponsored deal to destroy his chemical arsenal and joined the Chemical Weapons Convention. His government declared a 1,300-ton stockpile of chemical weapons and so-called precursor chemicals that can be used to make weapons amid international outrage at a nerve gas attack on the outskirts of Damascus.

Those weapons have been destroyed, but member states of the OPCW have repeatedly questioned whether Assad declared everything in 2013. The widely available chemical chlorine was not covered in the 2013 declaration and activists say they have documented dozens of cases of chlorine gas attacks since then.

The Syrian government has consistently denied using chemical weapons and chlorine gas, accusing the rebels of deploying it in the war instead.

The Syrian opposition activists claimed the attack was carried out either by Syrian government or Russian warplanes.