PRETORIA, South Africa (AP) - President Barack Obama says he does not feel threatened by the fact that other countries, led by China, are investing in Africa. In fact, Obama says the more countries that come to Africa, the merrier.

Obama says he's touring three African nations this week because the United States needs to increase its engagement with a continent that's showing promise and possibility.

He says such interaction is good for the US regardless of what other countries do.

But he cautions that Africa must be wary of outside investment and always ask how it will benefit when other countries come seeking its natural resources or to make other investments.

Obama spoke on Saturday during a news conference in South Africa with President Jacob Zuma.