Ukraine protesters reject amnesty offer by government President Yanukovych has 'acute respiratory disease' and a temperature Protesters reject amnesty offer saying 'these laws are a lie' Six killed in Kiev and other Ukrainian cities in widespread protests Activists are occupying key buildings and have erected street barricades Protesters in Kiev defiantly rejected an amnesty offer passed by the Ukrainian parliament that promised to free imprisoned activists if they stood down and left occupied buildings. Six people have been killed in Kiev and other Ukrainian cities in protests that erupted more than two months ago after President Viktor Yanukovich walked away from a treaty with the European Union under pressure from Russia. Protesters have occupied key buildings in various cities, set up encampments in squares and erected barricades in streets. Under the conditions of the amnesty these would have to be dismantled and buildings vacated. It allows for peaceful protests, though. A masked protester poses for pictures on the barricade during ongoing protests in Kiev Interior Ministry members stand guard near the site of clashes with anti-government protesters Defiant: Protesters in Ukraine have rejected an amnesty offer from the government Staying put: A masked protester in Kiev However, protesters aren't in the mood to stand down. "These laws are a lie and people don't trust them," Oleh, a protester from Kiev, told Channel 4 News. He added: "People were defending their constitutional rights and we actually don't understand what we need an amnesty." The amnesty offer follows several other concessions tabled by President Viktor Yanukovych, which included accepting the resignation of Prime Minister Mykola Azarov. However, the opposition won't budge and is demanding that Yanukovych himself stands down. So far he's refused to do so, but isn't currently fulfilling his duties as he's been taken ill with severe flu. A demonstrator has a meal near a fire at a barricade erected by anti-government protesters near the site of clashes with riot police in Kiev Tents of anti-government protesters are seen at Independence Square in central Kiev A statement from his office said: "The president is on sick leave with acute respiratory disease accompanied by an elevated temperature." There was no indication of how long he might be on leave. Meanwhile, the Obama administration is preparing financial sanctions that could be imposed on Ukrainian officials and protest leaders if violence escalates, according to Reuters. Congressional aides, who asked not to be identified by name because of the sensitive subject, said they had discussed the sanction preparations with administration officials. Self-defence troops rally in Kiev on January 29, marking the 96th anniversary of a 1918 battle near the small city of Kruty They said final details of the package have not been worked out, but it could be put in place quickly against government officials - or leaders of the protest movement - in case of widespread violence. Alarmed by the crisis, Washington has revoked the visas of some Ukrainian officials. President Barack Obama referred to Ukraine in his State of the Union address on Tuesday, voicing support for the principle that all people have the right to free expression. Anti-government protesters wait for a decision on the amnesty law at a barricade in Kiev Vice President Joe Biden has spoken to Yanukovich at least three times. And two U.S. senators, Republican John McCain of Arizona and Democrat Chris Murphy of Connecticut, traveled to Kiev last month and addressed demonstrations. The House Foreign Affairs Committee on Wednesday passed a resolution calling on all sides in the confrontation to refrain from violence and work toward a peaceful resolution. "The situation in Ukraine remains very volatile and more needs to be done," said Representative Eliot Engel, the New York Democrat who sponsored the resolution. We must remain engaged. Head of the Ukrainian UDAR (Punch) party Vitali Klitschko speaks on Independence Square in Kiev early on Thursday However, U.S. lawmakers and Obama administration officials said they were encouraged by recent developments, including the Ukrainian parliament's vote to repeal anti-protest laws. We were encouraged that Ukraine's parliament repealed the most egregious of the most anti-democratic laws. Today we want to urge President Yanukovich to sign the repeal laws," State Department spokeswoman Jen Psaki said at a news briefing. She told reporters the State Department has been willing to consider sanctions but no decision has been made. Alarm has grown elsewhere in the West. German Chancellor Angela Merkel telephoned Russian President Vladimir Putin and Yanukovich on Wednesday, urging a constructive dialogue between the government and opposition. Putin raised the pressure on Ukraine on Wednesday, saying Russia would wait until Ukraine forms a new government before fully implementing a $15billion bailout deal that Kiev urgently needs.