Federal authorities in court filings have pointed to cellphone records and accused one of Syed's sons of possibly helping his father track one of the victims.
The lengthy pattern of violence — which began not long after Muhammad Syed arrived in the U.S. in 2016 — has shocked members of Albuquerque's small, close-knit Muslim community.
The clinic is now headed to Las Cruces, New Mexico, about 40 miles north of El Paso, Texas.
Dangerous winds have picked up again, threatening to spread spot fires and complicate work for firefighters.
The declaration releases emergency funds to recovery efforts in three counties in northeastern New Mexico.
The crash occurred in February. The school bus was carrying 23 children at the time, according to police.
New Mexico faces a long and potentially devastating wildfire season, said Gov. Michelle Lujan Grisham, as Southwestern wildfires cause destruction and force people from their homes.
New Mexico Gov. Michelle Lujan Grisham signed emergency declarations, and in Arizona, a Flagstaff-area fire burned 30 homes and numerous other buildings.
Firefighters are bracing for the return of ferocious winds in the Southwest after a brief reprieve allowed them to attack flames from the air for the first time in days.
Fire managers across the Southwest are reckoning with strong winds that forecasters say could lead to explosive growth in wildfires this week.