HAVERHILL, MASS. >> Fire officials have characterized a blaze that caused approximately $70,000 in damage to the exterior of a Massachusetts church as suspicious.

Haverhill Fire Chief Jack Parow says Tuesday morning's fire at Riverside Church was ignited by an accelerant that was poured along the side of the building. Flames did not spread to the interior of the church and no injuries were reported.

The chief the fire is "definitely suspicious" and remains under investigation.

Pastor Paul Soucy says a suspect or motive for the blaze is a "mystery" to the congregation.

The city is offering a reward of up to $5,000 for information that could lead to an arrest.

The church set up a fund to cover repairs.