At least 24 people, mostly Shia Muslims, have been killed and many others injured in a fresh wave of terrorist attacks to hit Iraqi cities.The deadliest attack occurred in the town of Taji, north of Baghdad, when a bomber blew himself up inside a mosque at about 8:00 p.m. (1700 GMT), killing 15 people and injuring more than 31 others. The al-Rahman mosque is frequented by Shia Muslims and lies in a Shia-majority part of the town. Elsewhere, a bomber detonated his explosive-laden vehicle near a police patrol on the southern outskirts of the main northern city of Mosul. The explosion killed four people, including a policeman. In Salahuddin province, gunmen sprayed bullets on a police patrol in the town of Tuz Khurmatu, killing three and wounding a fourth. In a separate incident, two people were killed and four more wounded when militants opened fire on day laborers waiting near a grain silo in Tikrit, located about 140 kilometers northwest of Baghdad. There was no immediate claim of responsibility for the attacks.