BAGHDAD (Agencies) - A female suicide bomber attacked a tent filled with women and children resting from Karbala south of Baghdad on Friday, killing 40 people and injuring 60 others, said officials. Iraqi officials have mounted an extensive security operation to protect the people, who will be celebrating Monday's end of 40 days of mourning that follow Ashura. About 40,000 Iraqi troops have been deployed along major routes to Karbala, and officials say security cameras have been installed near the shrine of Hazrat Imam Hussein (RA) to keep a lookout for possible threats. It was the deadliest attack in Iraq this year and the third straight day of bombings against Shias. The tent where the bomber detonated her explosives was located on a route to Karbala, where hundreds of thousands of Shia devotees will converge for an important religious ceremony on Monday, said a police official. He spoke on condition of anonymity because he was not authorized to talk to the media. Separate tents for men and women are set up along the road to Karbala to offer food, drinks and a place to rest. Interior Ministry spokesman Maj-Gen Abdul-Karim Khalaf confirmed the attack and said security officials were rushing to the scene, located between the cities of Mussayib and Iskandariyah about 40 miles south of Baghdad. Muhammad Abbas, a medical official in Mussayib, said most of the dead and wounded from the attack were women and children. Sadiya Kadom, a 40-year-old woman from Baghdad, said she was walking near the tent at the time of the explosion and suffered injuries to her legs and hands. "It was a horrific scene with dead and screaming injured people on the ground," said Kadom. Hussein Faris, a 39-year-old from Baghdad who lost his wife in the attack and was wounded in the stomach, said people at the scene panicked. "I was so terrified," said Faris. "People nearby stampeded, and many were hurt by that." Also Friday, an old mortar round killed two young boys - ages 10 and 15 - who were playing in the backyard of a farm house in Musayyib, about 40 miles south of Baghdad, said a police official. He spoke on condition of anonymity because he was not authorized to talk to the media. An Iraqi army general and his son were found shot dead at their apartment in a mainly Sunni district on Friday, Interior and Defence Ministry officials said.