The trial of 21-year-old Dzhokhar Tsarnaev, the accused Boston Marathon bomber, has concluded with a jury finding him guilty on 30 counts.

While deliberations will continue regarding whether the convicted bomber will be held in prison indefinitely or be put to death, numerous anomalies surrounding the event persist.

Drill DURING the bombing?

One of the most puzzling pieces of evidence supporting the notion that the event may indicate prior knowledge or government involvement emerged within moments of the bombs going off on April 15, 2013.

A University of Mobile track coach testified to local Alabama NBC affiliate WPMI that loudspeaker announcements were telling marathon attendees that bomb-sniffing dogs at the start and finish lines were part of a “drill.”

“They kept making announcements on the loud speaker that it was just a drill and there was nothing to worry about,” coach Alistair Stevenson told Local 15. “It seemed like there was some sort of threat, but they kept telling us it was just a drill.”

The next day Stevenson, defending his remarks, elaborated saying he had also seen “law enforcement spotters on the roofs at the start of the race,” and asserted that, “Evidently, I don’t believe they were just having a training exercise… I think they must have had some sort of threat or suspicion called in.”

Stevenson’s claims were corroborated after photos emerged showing a man walking on a roof near one of the bombings.

Men wearing backpacks pre-staged?

Another strange oddity was the presence of National Guard Civil Support Team members near the finish line before and immediately following the bombing, pictured wearing Craft International gear and earpieces.

The men were identified by members of the public and were subsequently ignored by federal authorities.

CST members were also photographed conversing with FBI personnel and police after the incident, suggesting that their presence was not covert, and was instead pre-planned.