The head of the security network for U.S. Jewish organizations said the community is "standing vigilant" following bombings at the Boston Marathon.
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Two people were killed and more than 30 injured in two blasts at the marathon on Monday, according to reports. One of the bombs exploded at the finish line.
"We know that unfortunately 30 percent of terrorist attacks had Jewish institutions as secondary targets," said Paul Goldenberg, director of the Secure Community Network.
"However, I must stress that there is absolutely nothing here that indicates any connection to an attack on the Jewish community. But based on history, we are standing vigilant for at least the next 48 hours."
Police exploded at least one device in Boston that did not go off.
The identity of any perpetrators has not been discovered.