Two people were killed and another injured in clashes between troops loyal to Yemeni President Ali Abdullah Saleh and opponents to his rule in the southern city of Taiz, television broadcaster Al-Jazeera reported Wednesday.
The pro-Saleh troops shelled the city's main square and several neighbourhoods, using tanks and mortar shells, it added, DPA reported.
The shelling was the fiercest in the restive city since army forces stormed the main square and torched protesters' tents there in late May, according to Al-Jazeera.
Millions of Yemenis have been demanding since February that Saleh step down after 32 years in power.
More than 350 people have been killed in the government crackdown on protesters, rights groups said.
Saleh is in a Saudi Arabian hospital, recovering from serious wounds suffered in an attack on his presidential palace in early June.