ALLENTOWN, Pa. -

A fire broke out in Allentown Saturday morning.

According to fire officials, crews responded to the blaze at 521 North Jordan Street just after 10 a.m.

They said smoke from the two-alarm blaze could be seen from a few blocks away.

Firefighters were able to get the blaze under control in less than an hour.

Officials said there was heavy damage to the first floor and heat and smoke damage to the second and third floors.

They said neighbors threw a ladder up to the porch roof, allowing residents to escape.

The Red Cross is assisting the displaced residents, including four adults and three children.

Officials say a pregnant woman was taken to the hospital for observation but she is expected to be fine.

An unoccupied house nearby suffered heat and smoke damage. Another home sustained smoke damage, but no one from that home was injured or displaced.

The blaze is still under investigation. There is no word yet on what caused it.