Bangkok, Thailand (CNN) -- The lead

Bangkok, Thailand (CNN) -- The leader of anti-government demonstrations in Thailand on Sunday urged Yingluck Shinawatra to resign, the latest move in a relentless campaign to oust the prime minister.
Protest leader Suthep Thaugsuban, a former deputy prime minister under the previous Democrat-led government, gave Yingluck two days to "return power to the people unconditionally," Suthep's group said.
The face-to-face meeting came the same day protesters tried to force their way into the government headquarters and a police club compound, hoping to find Yingluck. Police fired tear gas to disperse them.
"The most violently active areas are around the Government House," said Lt. Gen. Paradon Pattanathabut, referring to the government headquarters.
The prime minister was not at the police club compound as she was rumored to be when demonstrators stormed the building.
The state television station, Thai Public Broadcasting Service, continued with its regular programming. But officials there were in negotiations with the protesters, said to number in the hundreds, said government spokesman Teerat Rattanasevi.
Laying siege to Government House would be a symbolic victory for the demonstrators. It's the seat of power.
Yingluck moved her offices to another location when the unrest bubbled over.
Undeterred, protesters -- with handkerchiefs covering their noses and mouths to ward off the sting of tear gas -- threw rocks across the fence that rings Government House toward the phalanx of riot police on the other side.
In response, police lobbed tear gas, causing protesters to scurry. A few minutes later, they returned.
So it went for the better part of the day.
10 questions: What's behind the protests in Thailand?