NEW YORK (CNN) -- A federal jury indicated Monday that it may be divided on whether to sentence convicted Kenya embassy bomber Mohamed al-'Owhali to death.
In a note sent to the judge an hour before adjourning the third full day of deliberations, the jurors asked what to do if they could not reach a unanimous verdict.
"The consequence is that the defendant will be sentenced to life imprisonment," wrote U.S. District Judge Leonard Sand in reply.
"Continue your discussion until you are fully satisfied that no further discussion will lead to a unanimous verdict in favor of death," Sand instructed.
The way the verdict form is printed, the jury's only options are to check off a unanimous verdict for either life imprisonment without the possibility of release or the death sentence. The choice of a non-unanimous verdict does not exist.
Al-'Owhali defense attorney Fred Cohn said the note indicated the jury must be deadlocked and the judge should instruct them to return a sentence of life in prison.
"I don't think we should assume they are deadlocked," said Assistant U.S. Attorney Patrick Fitzgerald, adding that a deadlock does not mean "they are unanimously against the death penalty."
Fitzgerald, quoting a U.S. Supreme Court decision, said it was in the government's interest to know the "conscience of the community," and that in fairness to the victims the court should ascertain how the jury is divided.
"While victims rights have taken over our lives," Cohn said, "I don't think their comfort is the final issue."
Sand decided to instruct the jury that it should reply it "does not unanimously find that the death sentence is appropriate," if that becomes the panel's conclusion. The consequence would then be a life sentence, all parties agreed.
Al-'Owhali's fate is the hands of the same seven women and five men who decided on May 29 that he was guilty of carrying out with others the August 7, 1998, bombing of the U.S. Embassy in Nairobi, Kenya, and that he was guilty of killing the 213 people who died from the explosion.
Al-'Owhali, 24, a Saudi, and three codefendants were also convicted of engaging in a worldwide terrorist conspiracy to kill Americans, a conspiracy allegedly led by Saudi exile Osama bin Laden.
Two of the defendants, Mohamed Odeh, 36, a Jordanian, and Wadih el Hage, 40, a naturalized American, face a maximum sentence of life in prison.
Khalfan Khamis Mohamed, 27, a Tanzanian, also convicted of carrying out a nearly simultaneous truck bombing at the U.S. Embassy in Dar es Salaam, Tanzania, where 11 people died, will be subject to a death penalty proceeding after al-'Owhali's sentence is decided.
Earlier Monday, jurors signaled they were focusing on defense arguments to spare al-'Owhali the death penalty.
The arguments, known as mitigating factors, appear at the end of a list of 18 questions the jury must answer before voting on punishment.
There are 11 aggravating factors that fall under the prosecution's domain and seven mitigating factors that fall under the defense's. While a few aggravating factors are prerequisites to a death sentence, most factors serve as a non-binding guide to organize deliberations.
Aggravating factors include whether al-'Owhali poses a continued, dangerous threat to society, even behind bars.
Mitigating factors include whether al-'Owhali was indoctrinated in ultra-conservative Muslim teachings that promoted "jihad," or holy war, and martyrdom.
The jury in a previous note asked whether "jurors' personal knowledge, such as developmental psychology, social learning, and abnormal personality can be used" in their deliberations.
In reply, Sand told the panel to draw on "all of the knowledge, training, education, and experience you have acquired during your lifetime" but instructed them to "base your decision only on evidence presented, using your knowledge and experience to weigh that evidence."
In his original instructions last week, Sand said, "your decision on the question of punishment is a uniquely personal judgment which the law, in the final analysis, leaves up to each of you."