Witnesses and doctors say that Yemeni security forces have opened fire on protesters in the capital, Sanaa, killing at least eight people.
Reports say that dozens of people were also injured in the shooting.
The demonstrators want President Ali Abdullah Saleh out of power immediately.
Saleh has accused his opponents of attempting a "coup against democracy and the constitution."
Today's reported violence comes a day after the government and opposition agreed to sign a deal soon under which Saleh would step down after 30 days.
compiled from agency reports