A strong tsunami triggered by a magnitude 7.5 earthquake has hit a coastal Indonesian city, officials say.brWaves of up to 2m (6.6ft) high swept through Palu on Sulawesi island, not long after authorities had lifted a tsunami warning.brA tsunami warning was announced but lifted within the hour.brThe dramatic video footage of the tsunami hitting Palu shows the high waves sweeping away several buildings and then the large tilted mosque in the town, about 80km from the quake's epicentre.