Iran's response to the assassination of a nuclear scientist in Iran Wednesday will reach beyond borders and the region, a website aligned with the regime in Tehran quoted a senior security source as saying Thursday.

Those who gave the order for the assassination, the source was quoted as saying, "will never feel safe," adding that Iran's will have a cross-border, cross-regional strategy to strike back.

He said that Tehran has entered "a new era of intelligence operations against its enemies."

A university professor and department head of a uranium enrichment facility was killed by a bomb placed on his car by a motorcyclist in Tehran on Wednesday, Iranian media reported, in an incident that looked similar to attacks on nuclear scientists in the city more than one year ago.

Reuters contributed to this report.

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