LAHORE, Pakistan (AP) — Pakistani officials said Sunday that four Islamic extremists allegedly involved in a 2009 attack on the visiting Sri Lankan cricket team were killed in a shootout with police. Pakistan has stepped up its fight against extremist groups over the past two years, including with a military offensive in North Waziristan, a tribal region near the Afghan border and longtime stronghold of al-Qaida and other militants. On Sunday, security forces raided a religious seminary on the outskirts of the southwestern city of Quetta, where a suicide bomber killed more than 70 people earlier this month, and sealed it when they found nearly 100 illegal Afghan immigrants residing there, provincial government spokesman Anwarul Haq said.