Mugabe was quoted by state-controlled media as saying at a rally on Monday: "Britain and her allies are telling a lot of lies about Zimbabwe, saying a lot of people are dying ... They want to build a situation to justify their intervention."
Tsvangirai's Movement for Democratic Change said police raided its Harare offices and took away more than 60 victims of violence sheltering there, including women and children.
Zimbabwean police commissioner-general Augustine Chihuri said the police had been "shocked and surprised" by Tsvangirai's decision to seek refuge in the Dutch embassy.
"It is obviously a calculated move to besmirch the presidential run-off election ... and further brutalise the image of Zimbabwe," Chihuri told a news conference. "We wonder from whom Mr Tsvangirai is running away or hiding."
Chihuri was quoted as saying by the state-owned Herald newspaper on its website that Zimbabwean police had no plans to arrest Tsvangirai.
"We therefore declare that Mr. Morgan Tsvangirai is under no threat at all from Zimbabweans and he should cast away these delusions," he was quoted as saying.
Dutch newspaper De Telegraaf reported on its website that the government of the Netherlands had received assurances from Zimbabwean authorities that Tsvangirai and embassy staff will be safe.
When he announced his withdrawal on Sunday, Tsvangirai said his supporters would have been risking their lives if they had voted but that he was ready to negotiate with Mugabe's ZANU-PF party if the violence stopped.
The political and economic crisis in Zimbabwe has sent millions of refugees flooding into neighbouring countries.
The African Union and Southern African Development Community were discussing the situation after Tsvangirai's pullout.
U.S. Secretary of State Condoleezza Rice said even if the run-off went ahead it would not legitimise Mugabe's government.
Mugabe, in power since independence from Britain in 1980, has vowed never to hand over to the opposition, branding its officials as puppets of the West.
He denies his supporters are responsible for the violence, which broke out after he and ZANU-PF lost the March 29 polls.
Mugabe has presided over a slide into economic chaos, including 80 percent unemployment and the world's highest inflation rate of at least 165,000 percent.
