The Islamic State in Iraq and the Levant (ISIL/ISIS) which is also known by the Islamic State (IS) has claimed responsibility of an attack that left 14 people killed in San Bernadino city of California.

IS said in an online broadcast that Wednesday’s attack on a social services agency party was carried out by

“Two followers of Islamic State attacked several days ago a center in San Bernadino in California, opening fire inside the center, leading to the deaths of 14 people and wounding more than 20 others” said al-Bayan, the group’s Iraq-based daily broadcast, on Saturday.

Meanwhile, investigation into the incident has spread to Pakistan, birth country of one of the suspects.

Tashfeen Malik had moved from Pakistan to Saudi Arabia with her family 25 years ago before landing in the United States last year with a new American husband.

According to two Pakistani officials, Tashfeen Malik was from the Layyah district of southern Punjab province.

Reports suggest that intelligence officials questioned members of Malik’s family, including her uncle, Javed Rabbani, the brother of her father, Gulzar.

Rashfeen Malik was the wife of another suspect of the carnage Syed Rizwan Farook, the US-born son of Pakistani immigrants.