The FBI released photos and video Thursday of two suspects in the Boston Marathon bombing and asked for the public’s help in identifying them, zeroing in on the two men on surveillance-camera footage less than three days after the deadly attack.

The photos depict one man in a dark baseball cap and the other in a white cap worn backwards. The men were seen walking together in the crowd, and the one in the white hat was seen setting down a backpack at the site of one of the blasts, said Richard DesLauriers, FBI agent in charge in Boston.

In a press conference Thursday, officials gave an update on the explosion in West.

Texas Attorney General Greg Abbott said the families affected by the blast have support from officials.

Police in Texas say between five and 15 people were killed in a fertilizer plant explosion that also injured more than 160 others.

Waco police Sgt. William Patrick Swanton said early Thursday morning that the death toll is only an estimate as search and rescue operations remain under way in downtown West.

Fatalities as a result of the explosion in West are confirmed, but a number is not yet known.

At a press conference held just after midnight, D. L. Wilson, Public Information Officer for the Texas State Troopers, confirmed that there had been fatalities but would not confirm a number. When asked on a previously reported death count of 60 to 70, Wilson declined to comment. Wilson did confirm a large number of injuries.