Waving colorful Tibetan flags in the air, the group shouted free Tibet slogans, forcing the Chinese officials to peep out from windows of the Chinese over sea office.
"Tibet belongs to Tibetans, China out of Tibet," shouted the group.
The group of Tibetans from Minnesota were joined by other Tibetans residing in and around Chicago.
As the group stormed the Chinese office in Chicago, another group, around three hundred Tibetans who couldn't join the protest in Chicago marched across Downtown Minneapolis in Minnesota calling for international intervention to end the ongoing Tibetan crisis in Tibet.
"Today is a historical day for Tibetans whole over the world as on this same day in 1959, thousands of Tibetans in Tibet rose up and revolted against the Chinese government in order to protect their leader (the Dalai Lama) and the Tibetan nation from the Chinese invation," said Tsewang Rigzin, former head of the largest non-governmental Tibetan organisation, Tibetan Youth Congress.
"Until and unless, we success to protect our leader and our nation, it is the responsibility of all Tibetans to take part in the movement," said the former head of Tibetan Youth Congress.
Sonam Tsering, a Tibetan immigrant in the United States who calls "Minnesota as his second homeland" expressed his solidarity with the plight of Tibetans inside Tibet.\
"We Tibetans are always peaceful. Tibetans in Tibet never resort to any kind of violence when ever they protest against the Chinese government," said Sonam Tsering.
"But what the Chinese government do is put more security personels and more force leading to more arrest and more torture," said Sonam.
On several occasions in the United States and in India in recent months, Tibetan Spiritual Leader the Dalai Lama has urged its people to be "careful" before holding any protest against the Chinese government.
The Dalai Lama told the Tibetans to think "twice" before holding any anti-China protest citing the consequences which he said would face by the Tibetans inside Tibet.
"We can shout in exile, but Tibetans inside Tibet are under China," said the Dalai Lama.
The Dalai Lama who is also a Nobel Peace Prize Laureate last week held a meeting with a group of Chinese and Tibetan students in the Downton Minneapolis.
Under the patron of Tibetan spiritual leader, Tibetan Government in Exile had publically declared that Tibetans are willing to stay under the Chinese government if a "genuine autonomy" is given to the Tibetans.