Toledo is a visiting professor at Stanford University, near San Francisco, where he graduated with a PhD in economics.
Peru's government said Friday that it has information that Alejandro Toledo is in San Francisco.
Some Peruvians have speculated that Toledo might have traveled to Israel, where his longtime friend, Israeli businessman Yosef Maiman, is believed to live.
The current president of Peru, Pedro Pablo Kuczynski, who served under Toledo has urged him to return home. Reuters reported that Peru had been informed by the United States that authorities will not detain the former president during his stay, nor prevent him from boarding his flight to Israel.
According to the United States Department of Justice, Odebrecht has pleaded guilty and agreed in December to pay between US$ 2.6 billion and US$ 4.5 billion in a settlement with authorities in the United States, Brazil and Switzerland for paying nearly US$ 800 million in bribes to government officials around the world.
Israel said earlier Sunday it would not allow entry to Toledo, who is wanted in his homeland over accusations he took $20 million in bribes.
If captured, Toledo will be detained for up to 18 months as prosecutors prepare charges against him.
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Overall, Odebrecht officials said the company paid officials in Peru $29 million in bribes to secure government public works contracts from 2005-14, which includes the alleged bribes under presidencies of Toledo's successors Alan Garcia and Ollanta Humala.
A Peruvian court has issued an global warrant for the arrest of ex-President Alejandro Toledo on suspicions of taking bribes from a Brazilian construction giant at the heart of a region-wide corruption scandal.
He said Toledo met the head of Odebrecht Peru, Jorge Barata, in a luxury hotel in Rio de Janeiro in 2004 and promised to help the firm win two highway contracts in exchange for $35 million.
But he has struggled to explain where the money came from.
Peru has an extradition treaty with the United States but does not have one with Israel.
Peruvian authorities have also contacted Interpol, which issued an alert to its 190 member states.
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