Assalam alaikum wa rahmatullahi wa barakatuhu !
All muslims should break the fast when they hear the athan for maghrib because there is a hadeeth that sais that we should urge to break the fast as soon as possible after the sunset, even if it is just with a sip of wather.
May Allah subhana wa ta'ala accept out fast and belss us all with a place in Jannah.Ameen!:tti_sister: