The killings of the doctors come after the attack Friday on polio vaccinators in Kano, northern Nigeria’s most populous city. No group has yet claimed responsibility for that attack either, though it follows alleged Boko Haram attacks now focusing on softer targets, like lightly guarded mobile phone towers. Those mobile phone tower attacks have limited the ability of residents and security forces to call for help during attacks, as well as have cut the government’s ability to use the signals to track suspected militants.
In a statement Friday, President Goodluck Jonathan condemned the killings of the polio workers and promised that efforts to cut child mortality wouldn’t be stopped by ‘‘mindless acts of terrorism.’’
‘‘While the government will continue to do everything possible to track down and apprehend agents of terrorism in the country, the president has directed that enhanced security measures be put in place immediately for health workers in high-risk areas,’’ the statement read.
Despite that promise, however, attackers were able to kill the North Korean doctors and apparently slip away. Reuben Abati, a presidential spokesman, did not respond to a request for comment Sunday.
Associated Press writers Jon Gambrell in Johannesburg and Hyung-jin Kim in Seoul, South Korea, contributed to this report.