Severe weather in Oklahoma has left four people dead, including a 12-year-old boy and his mother, officials say.

Additional heavy rain is expected across the Plains this week. With streams already swollen and the ground saturated, that leaves the area at risk of additional flooding.

Flash floods and tornadoes led to five deaths in Oklahoma as severe storms hit parts of that state as well as Texas and Missouri over the Easter holiday weekend. Tens of thousands lost power at the height of the storms,