Police: Blasts at Buenos Aires banks kill 1
 |  Police work at the scene of an explosion at a Citibank branch Wednesday. |
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BUENOS AIRES, Argentina (CNN) -- Explosions ripped through three Buenos Aires banks on Wednesday, killing a security guard, police in Argentina said.
No one has claimed responsibility for the explosions, police said, which occurred during an official state visit by Chinese President Hu Jintao. Hu is on a tour of Latin and South American nations.
The blasts hit two Citibank branches and a branch of Galicia Bank just after 9 a.m. (7 a.m. ET), authorities said. The security guard who was killed was holding a package at a Citibank branch when it detonated, police said.
A U.S. official told CNN there is no evidence the bombings are the work of international terrorists. Argentinian police, the official said, referred to the explosive devices as "pamphlet bombs" -- not large enough to do any serious damage.
"We're mostly talking about shattered windows, although one man appears to have been killed," the source said.
Authorities also said two additional explosive devices were found at each bank branch. One device was discovered in a tree in front of a Citibank branch, police said.
Police are interviewing people at the explosion sites, looking for possible witnesses.
In recent years, foreign-owned banks have been the target of local groups in Argentina.
Carolina Cayazzo and Pam Benson contributed to this report.
