No deaths have been documented in Syria since a ceasefire brokered by Russia and the US entered its first full day, according to the Syrian Observatory for Human Rights (SOHR).
At least 14 violations were reported since the ceasefire took effect on Monday, but most parts of Syria remained relatively calm, the SOHR's Rami Abdulrahman told Al Jazeera.
"No one has died from gunfire over the past 15 hours," he said on Tuesday at 12pm Damascus local time (09:00 GMT). "This is so far the most successful ceasefire to take place in the country."
Al Jazeera's Stephanie Decker, reporting from Gaziantep on the Turkey-Syria border, said that while the guns have not gone quiet, there definitely is a military de-escalation.
"No one expected the gunfire to totally stop anyway, including the US," she said.
The AFP news agency reported that residents on both sides of divided city Aleppo passed the night without opposition rocket fire into government-held areas or regime air strikes against rebel districts.
Eid al-Adha holiday
Residents remained out on the streets until midnight, AFP said, taking advantage of the truce to celebrate the first day of the Muslim Eid al-Adha holiday.
In the opposition-held central Syrian town of Talbiseh, which came under heavy fire in the run-up to the truce, activist Hassaan Abu Nuh said the government's bombardment had stopped.
"We usually stay up all night with the airplanes, but thank God last night we could all sleep," he told AFP.
In the largely rebel-held northwestern province of Idlib, where air strikes killed 13 people on Monday, an activist reported a quiet night too.
READ MORE: Syria ceasefire deal explained
John Kerry, the US secretary of state, said in Washington that while it was "far too early to draw conclusions" about the success of the ceasefire, initial reports of the first two hours suggested "some reduction" in violence.
"I urge all the parties to support it because it may be the last chance that one has to save a united Syria," he said.
The deal, approved on Friday by Kerry and his Russian counterpart Sergey Lavrov, aims to put an end to more than five years of war between forces loyal to President Bashar al-Assad and rebel groups, and usher in a political transition.
The truce does not apply to the Islamic State of Iraq and the Levant (ISIL) group or the Jabhat Fateh al-Sham, the group formerly known as al-Nusra Front, which changed its name after cutting ties with al-Qaeda in July.
Source: Al Jazeera News And Agencies