Iranian authorities said on Friday that 19 people lost their lives in a suicide bomb attack on a mosque in the southeast of the country, the IRNA state news agency reported.

They also say that 125 people were injured in Thursday''s explosion at the Amir al-Momenin mosque in the southeast city of Zahedan, in the Sistan-Baluchistan Province.

Provincial governor Ali Mohammad Azad also said that 80 of the injured had been hospitalized.

Azad said that a "group of terrorists" had been detained in the province, adding that they had planned on carrying out more terrorist acts in the country.

"They planned to carry out other terrorist activities in other provinces and regions of the country," Azad was quoted by the state IRB news website as saying.

There are frequent confrontations between Iranian police, drug traffickers, smugglers and militants in Sistan-Baluchistan due to its location on the borders with Pakistan and Afghanistan.