Taiwan on Monday said it had closed a probe into pagers that exploded in Lebanon in September and caused a deadly blow to Iran-backed Hezbollah, saying no Taiwanese citizens or companies were involved.

Security sources have previously said the pagers carried the name of Taiwan-based Gold Apollo, a company which has asserted that it did not make them. Taiwan's government has also said the pagers were not made in Taiwan.

Taipei prosecutors, who were investigating the case, said in a statement the AR-924 pager model that exploded in Lebanon was manufactured, traded, and shipped by a firm called Frontier Group Entity, and made outside of Taiwan. They added, however, that Gold Apollo had authorised the company to use the Apollo trademark.

"There is no evidence indicating that any domestic manufacturers or individuals were accomplices in the relevant explosions, violating the Counter-Terrorism Financing Act, or engaging in other illegal activities," the prosecutors said in a statement.

"No concrete evidence of criminal activity has been discovered in this case, nor have any specific individuals been implicated in any criminal activity, following a comprehensive investigation."