The incident occurred in the staff colony of the Sui Southern Gas Company, a middle-class neighbourhood in Gulshan-e-Iqbal area, yesterday.
The mob ransacked the Christian boy's home and set furniture on fire.
Police said the boy was accused by local residents of sending text messages containing blasphemous content to employees and officers of Sui Southern Gas Company (SSGC) at the residential-cum-office compound, the Dawn newspaper reported.
After the news circulated among residents of the colony, a mob attacked the quarter of 16-year-old Ryan Stanten.
His mother, Rubina Bryan, works as a superintendent in Sui Southern Gas Company.
The boy and his mother were unharmed as they had left the quarter the previous night due to tension in the area.
The SMS was allegedly sent to local residents on Tuesday night.
"Had they not left the house, the situation could have been really bad," a senior police officer told the daily.
The mob ransacked the house and set fire to household articles, including a washing machine and a fridge, after bringing them out on the road.
The protesters shouted slogans against the Christian family.
The SMS was allegedly passed on by the teenager on his cell phone on Tuesday. After receiving it, some local residents had gone to the boy and asked him about it.
He told them that he had forwarded the SMS after he had himself received it, according to DIG Shahid Hayat.
"Ryan told complainant Khursheed Alam and Pesh Imam Qari Ghulam Qadir of the SSGC Jamia Mosque that someone sent him this SMS and he forwarded it to all Muslim friends without reading it," said Hayat.
