Store employee Abdel Hamdan was found safe in the trunk of a car Monday, about 12 hours after the fire, as police sought to get to the bottom of the attacks.
No arrests have been made in the kidnapping or the fire. But two men were arrested late Tuesday for their role in vandalizing the stores, Oakland Deputy Police Chief Howard Jordan said.
Donald Cunningham, 73, and Yusef Bey IV, 19, turned themselves in to face charges including robbery, felony vandalism and terrorist threats, Jordan said. Police have obtained warrants charging four others with similar crimes and expect to make arrests.
Jordan said it was too soon to say whether the vandals were connected to the kidnapping and fire.
The fire destroyed the store's merchandise and caused major structural damage to the building, police said.
Tuesday Hamdan told CBS News correspondent John Blackstone, "I get up this morning to pray and my wife, she said, 'they burn up the place,'" Hamdan said. "I don't believe it!"
"We're very happy that he came back safe," said Frank Hernen, manager of New York Market. "We don't want this to go further."
Last week, Hamdan's store and the nearby San Pablo Liquor store were
The incident at San Pablo Liquor was caught on surveillance tape, and police said they believe the same men trashed the New York Market.
Suspicion immediately fell on the Nation of Islam, a group of black Muslims whose members often wear suits and bow ties. However, Jordan said the suspects are not members of the Nation of Islam and Nation of Islam leaders denied any involvement in the attacks. He held out the possibility that they belong to a separate black Muslim group based in Oakland.
"Just because men were dressed in suits and ties, it don't mean that all black men who are dressed in a suit and ties are gang members, thugs," Tony Muhammad, a Nation of Islam representative, told CBS News.
In 1993, Muslims affiliated with that separate group, which operates the Your Black Muslim Bakery store chain and whose members also wear suits and bow ties, were involved in a similar incident at a Richmond liquor store, police said. Bey has been linked to that group, police said.
Investigators were looking into the recent vandalism as hate crimes because the store owners are of Middle Eastern background and are Muslims, Jordan said Monday.
"In both incidents, the suspects entered the store and questioned why a Muslim-owned store would sell alcoholic beverages when it is against the Muslim religion," police said in a statement Monday.
The federal Bureau of Alcohol, Tobacco, Firearms and Explosives is taking part in the investigation.