 Complete the following phrase:  After Erdişs arrest and subsequent conviction on December 29, 1998, followed by the detention of many lower-ranking figures in the group, IBDA-Cs activity seemed to quiet down. However, IBDA-C burst back into the headlines when it claimed responsibility for the dual synagogue bombing in Istanbul on November 15, 2003, which killed 24 and injured 255, as well as a subsequent attack on the HSBC Bank and British consulate on November 20, 2003 see 