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Photo taken on May 13, 2018 shows smoke rising from the site of an attack in Nangarhar province, Afghanistan. At least seven people, including one assailant, were killed and 20 others wounded after two blasts and ensuing gunshots rocked Jalalabad city, capital of eastern Nangarhar province, on Sunday. (Xinhua/Saifurahman Safi)

JALALABAD, Afghanistan, May 13 (Xinhua) -- At least seven people, including one assailant, were killed and 20 others wounded after two blasts and ensuing gunshots rocked Jalalabad city, capital of eastern Nangarhar province, on Sunday.

The incident occurred around midday when militants armed with suicide jackets and automatic guns stormed the provincial government's customs and finance department, triggering a gun battle, said an official on the condition of anonymity.

Afghan Special Operations Forces arrived at the scene shortly after the blasts, and sporadic firing was still ongoing as of Sunday afternoon, the source added. The number of casualties may further go up.

Security forces have cordoned off the area for precautionary measures.

Further details about the incident are still forthcoming amid the absence of any official statement.

No group has claimed responsibility for the attack yet.

Taliban militants and fighters of Islamic State outfit have presence in the province, some 120 km east of Afghan capital of Kabul.??