WASHINGTON — Support for the war in Afghanistan has reached a new low, with only 27 percent of Americans saying they back the effort and about half of those who oppose the war saying the continued presence of American troops in Afghanistan is doing more harm than good, according to an AP-GfK poll.

In results released Wednesday, 66 percent opposed the war, with 40 percent saying they were “strongly” opposed. A year ago, 37 percent favored the war, and in the spring of 2010, support was at 46 percent. Eight percent strongly supported the war in the new poll.

The poll found that far fewer people than last year think the killing of Osama bin Laden by US troops has increased the threat of terrorism against Americans. Overall, 27 percent say the Al-Qaeda leader’s death resulted in an increased terror threat, 31 percent believe his death decreased the threat of terrorism and 38 percent say it has had no effect.

The poll was conducted before the revelation this week of a recent Al-Qaeda plot to blow up a US-bound airliner with an underwear bomb.

Chris Solomon, an independent from Fuquay-Varina, North Carolina, is among the respondents who strongly oppose the war. — AP