Istanbul, Jan 07 (ANI): A female suicide bomber blew herself up inside a police station in Istanbul's Sultanahmet district, killing one officer and wounding another, the city's governor. Police sealed off the street where the attack happened. The woman spoke english as she entered the building but her nationality and identity were unknown, Governor Vasip Sahin told reporters at the scene. Turkish media later said one of the officers died from his wounds. There was no immediate claim of responsibility but the bombing comes less than a week after far-left group DHKP-C said it was behind a grenade attack on police near the prime minister's office in Istanbul. The group was also behind a suicide bombing at the US Embassy last year as well as attacks on Turkish police stations. Turkey also faces other security threats.