SURABAYA, Indonesia, May 13, 2018 (AP) — Suicide bombers on motorcycles and including a woman with children targeted on Sunday Mass congregations in three churches in Indonesia's second largest city, killing at least 11 people and wounding dozens in one of the worst attacks on the Christian minority, police said. The first attack struck the Santa Maria Roman Catholic Church in Surabaya, killing four people, including one or more bombers, police spokesman Frans Barung Mangera told reporters at the scene. He said two police officers were among a total of 41 wounded. The blast was followed by a second explosion minutes later at the Christian Church of Diponegoro and a third at the city's Pantekosta Church, Mangera said. President Joko "Jokowi" Widodo arrived in Surabaya, the East Java provincial capital, in the aftermath of the attacks, Mangera said. The bombings were the worst since a series of attacks on churches on Christmas Eve in 2000 killed 15 people and wounded nearly 100. Religious minorities, especially Christians, have been repeatedly targeted by terrorists. A senior police official said the bombings were carried out by at least five suicide bombers, including a veiled woman who had two children with her. The official spoke on condition of anonymity because he wasn't authorised to speak to the media. A witness described the woman with children, saying she was carrying two bags at the Diponegoro church. "At first officers blocked them in front of the churchyard but the woman ignored and forced her way inside. Suddenly she hugged a civilian then (the bomb) exploded," said a civilian guard named Antonius. Shattered glass and chunks of concrete littered the entrance of the Santa Maria Church, which was sealed off by heavily armed police. Rescue personnel treated victims on a nearby field while officers inspected wrecked motorcycles in the parking lot that were burned in the explosion. In Jakarta, the Indonesian Church Association strongly condemned the attacks and called on people to wait on authorities to investigate. "We are angry with these attacks, but we leave it to the authorities to resolve them," said Gormar Gultom, an official with the association. National police spokesman Setyo Wasisto announced that police fatally shot four suspected militants and arrested two others early on Sunday in West Java towns. It wasn't clear if the shootings were connected with the church attacks.