Both countries recently said they wished to step up security co-operation after the Boston Marathon bombing.
The initial reports of the Boston Marathon bombing Monday afternoon added to investors' jitters.
After the Boston Marathon bombing, she encouraged church members to make a sign showing support for the victims.
The Kommersant newspaper said he was investigating the suspects in the Boston Marathon bombing attacks, who came from the Caucasus.
The graphic images and accounts from the Boston Marathon bombing have thrown the issue of amputation into the national spotlight.
The race is being staged amid heightened security, as police take extra precautions after the Boston Marathon bombing six days ago.
Authorities have said they believe MIT police officer Sean Collier was killed that night by the suspects in the Boston Marathon bombing.
CNN: Latest developments in the Boston bombing investigation
While it may seem impossible to contemplate now, in time some survivors of the Boston Marathon bombing may come to see 15 April 2013 as the day their lives began.
News of the letters came around the same time as the April 15 Boston Marathon bombing, leading to initial speculation that the two acts were part of a coordinated terrorist plot.
On television nationally, the scope of the tragedy was overshadowed by the dramatic events in New England, as investigators there pursued leads in the Boston Marathon bombing investigation, then pursued their suspects.
CNN: Texan town tries to rebuild with community, spirituality
Russian president Vladimir Putin said he wished the information they had on the Boston Marathon bombing Tsarnaev family in 2011 was more helpful to the FBI at the time they had shared it.
FORBES: On Boston Marathon Bombing, Russia's Putin Has Regrets
News of the memo follows reports that two friends of Boston Marathon bombing suspect Dzhokhar Tsarnaev, who are now charged in connection with the attack, may have been in the country on expired student visas.
Investigators are awaiting test results to determine whether Todashev's DNA was found at the Massachusetts triple murder scene and whether DNA of Boston Marathon bombing suspect Tamerlan Tsarnaev, an acquaintance of Todashev, also was found there.
President Barack Obama said Tuesday at a news conference that the U.S. counterterrorism bureaucracy "did what it was supposed to be doing" before the Boston Marathon bombing as his top intelligence official began a review into whether sensitive information was adequately shared and whether the U.S. government could have disrupted the attack.
"Obviously, we have to factor in what happened in Boston, " the commissioner said, referring to the April 15 double bombing at the Boston Marathon that killed three people and injured more than 260.
Hundreds of thousands of Boston-area residents remained shuttered indoors after a wild overnight shootout killed one of the men suspected of bombing the Boston marathon and set off a massive manhunt for another suspect.
FORBES: Boston Still Shuttered As Hunt For Bombing Suspect Continues
Just hours later, Ms. Lu became a victim of the bombing at the Boston Marathon.
Most recently, she has reported from the scenes of the bombing at the Boston Marathon in Massachusetts and the shooting at Sandy Hook Elementary School in Newtown, Connecticut.
Many competitors wore a black ribbon and observed a 30 second silence in honour of those killed and injured in last week's bombing at the Boston marathon.
BBC: Ed Balls thanks Osborne for sponsoring his marathon effort
The news was disclosed to senators at a closed-door briefing with the FBI and Homeland Security Department officials called to discuss Monday's bombing at the Boston Marathon.
The municipalities hosting two New York City-area marathons Sunday will add police and clamp new security measures on runners and spectators following last month's bombing at the Boston Marathon.
WSJ: New York Area Races Increase Security After Boston Marathon Bombing
He had asked police in Puerto Rico and New York, where he lives part of the time, to investigate first, then went to the FBI after the message was posted with an apparent reference to the April 15 bombing at the Boston Marathon.
Authorities say they have no reason to believe the suspect letters are related to the bombing attack at the Boston Marathon on Monday, and they noted that false positive tests for ricin are common.
Former roommate Khusen Taramov said the FBI was asking questions about a conversation Todashev had with the older bombing suspect a month before the Boston Marathon attack.
After a daylong manhunt that saw police searching door-to-door through Boston, law enforcement officials captured the remaining suspect believed to be responsible for Monday's bombing at the finish line of the Boston Marathon.
After the Marathon bombing, the world expressed solidarity with the people of Boston. (Even the New York Yankees paid tribute.) After the Texas explosion, there were immediate outpourings of sympathy and charity.
Also on Monday, Kazakhstan's Ministry of Foreign Affairs issued a statement saying two foreign nationals arrested Saturday in the Boston area on immigration violations are from Kazakhstan and may have known the two Marathon bombing suspects.
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