By Jennifer Levitz 

BOSTON--The defense in the Boston Marathon bombing trial rested Tuesday after seeking to show that Dzhokhar Tsarnaev's older brother took the lead in gathering bomb components and downloading the anti-U.S. jihadist propaganda that allegedly motivated the siblings.

An online al Qaeda-linked article titled "Make a Bomb in the Kitchen of Your Mom" was downloaded to a computer belonging to older brother Tamerlan Tsarnaev in December 2011 and was transferred to the younger brother's laptop a month later, testified defense witness Mark Spencer, a digital forensics consultant.

In addition, Tamerlan's computer showed searches for information related to the Boston Marathon and bomb parts ahead of the April 2013 attack, he said. A top activity on Dzhokhar's laptop was Facebook, he said.

But under cross-examination, Assistant U.S. Attorney Aloke Chakravarty pointed out that Dzhokhar Tsarnaev's laptop showed other activity leading up to the bombings. "There were multiple searches related to jihad as well, right?" he said.

"I believe so," Mr. Spencer said. Searches on that laptop, he said, included the phrases "jannah al firdous"--which refers to the highest levels of paradise--and "call of the jihad."

The defense team in the high-profile federal trial called only four witnesses, compared with more than 90 government witnesses. Closing arguments for both sides are expected Monday.

Write to Jennifer Levitz at jennifer.levitz@wsj.com

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