BANGKOK, Jan. 14 -- Thailand's anti-government protest leader Suthep Thaugsuban threatened Tuesday to capture caretaker Prime Minister Yingluck Shinawatra and key cabinet ministers and even to take them into custody if they do not resign.

Speaking on one of the rally stages, Suthep said the protesters would lay siege to all government offices in the next two to three days.

If the caretaker government refuses to resign as the People's Democratic Reform Committee (PDRC) requires, the PDRC would escalate the protest by blockading the houses of Yingluck and key cabinet members, he said.

He also said if they still refuse to budge, the protesters would even take the prime minister and cabinet ministers into custody.

Suthep launched the "Bangkok Shutdown" movement on Monday, aiming to paralyze the capital and force Yingluck to step down to pave the way for an unelected "people's council" to roll out reform.

Yingluck on Tuesday called on Suthep and the main opposition Democrat Party to take part in Wednesday's talks over the Election Commission's proposal to postpone the February 2 election.

"The Democrat Party and all other parties are dutifully supposed to contest the election. How could we possibly go on without a rule of law? And those protesters pushing for reforms should come over for talk so the sought-after reforms could be materialized.

"The street protests are merely hurting the country and putting everybody in trouble," she said.

But Suthep abruptly turned down talks with the caretaker government and vowed to fight until it is deposed.