What we know — and don't — about the migrants arriving in Denver

• Another 40 to 50 migrants arrived last weekend.

Details: Based on what city officials have heard from migrants, many communicated and organized on Facebook to travel to Denver.

• The migrants are largely from Central and South America, including Venezuela.
• On Tuesday, the city opened a recreational center as an emergency shelter to accommodate 120 people.

What they're saying: Evan Dreyer, Mayor Michael Hancock's deputy chief of staff, said Thursday he was unsure why they chose Denver.

• Other migrants have gone to mountain communities, according to emergency management office spokesperson Mikayla Ortega.
• Among the migrants were three to four children, per Mimi Scheuermann, chief operating officer at Denver Human Services

By the numbers: All told, at least 300 migrants have arrived in Denver over the past two months, Dreyer said.

• The city expects that number to grow, though it's unclear by how many.

Context: Governors in states such as Texas or Florida have sent migrants to liberal cities like Denver, but there's "no evidence of that" in this case, Dreyer said Thursday.

• The migrants were expected, and Dreyer said the city had seen "a slow, steady" number of arrivals — between 20 to 30 a day — over the past few months.

The intrigue: Denver officials are perplexed by the sudden jump in migrant arrivals.

• In addition, their immigration status is unclear and it's unknown how long they intend to stay.

Zoom in: Office of Immigrant & Refugee Affairs director Atim Otii said the Denver Immigrant Legal Services Fund will help people seeking to permanently relocate in Denver.

• Dreyer said the city is putting a call out to faith-based and nonprofit organizations for help.
• The city is also asking people who are interested in making donations to visit its website, which has links to several nonprofits helping the city.