The Oklahoma City Red Cross will open shelters as first responders assess damage. The organization says in the immediate aftermath, the best way to help is to donate at RedCross.org or text REDCROSS to 90999.

The Salvation Army has mobilized a number of emergency relief services in Oklahoma, including Moore, to dispense food, hydration and emotional support to first responders and survivors. Donate online or text STORM to 80888 to contribute $10 to the Salvation Army’s relief efforts or make a donation via phone at 1-800-SAL-ARMY.

Samaritan’s Purse, a nonprofit that fights poverty, has sent a disaster relief unit and staff to help people affected by the tornadoes in Oklahoma City. Find out how you can support the organization’s efforts here.

Operation USA will work with Oklahoma’s impacted community clinics and hospitals to help replace lost equipment and supplies as well as make grants to the extent of available funds from the public to help replace health resources lost. Learn more here.

Feeding America will deliver truckloads of food, water and supplies to impacted areas through its network of more than 200 food banks and 61,000 agencies. The organization’s food banks will also set up additional dropoff sites. Learn more here.

RYOT, an online advocacy site, is collecting donations and will waive all processing fees so that victims receive 100 percent of donation amounts. Learn more here.

Save The Children Save the Children’s U.S. emergency response team will deploy Child Friendly Space kits in shelters, helping to create a safe and secure atmosphere for displaced kids. The organization is also prepared to deploy infant and toddler hygiene materials, as it has for past disasters such as the tornado that struck Joplin, Mo.